Many WP_DEBUG errors upon initial plugin activation (some due to PHP 7)

Wow, lots going on here upon initial plugin activation. Note that create_function() is deprecated in PHP 7 but is really easy to fix.

PHP Notice:  Undefined variable: wpdb in /app/public/wp-content/plugins/ultimate-wp-mail/Main.php on line 16
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. activate_plugin() /app/public/wp-admin/plugins.php:43
PHP   3. include_once() /app/public/wp-admin/includes/plugin.php:555

PHP Notice:  Trying to get property 'prefix' of non-object in /app/public/wp-content/plugins/ultimate-wp-mail/Main.php on line 16
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. activate_plugin() /app/public/wp-admin/plugins.php:43
PHP   3. include_once() /app/public/wp-admin/includes/plugin.php:555

PHP Notice:  Undefined variable: wpdb in /app/public/wp-content/plugins/ultimate-wp-mail/Main.php on line 17
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. activate_plugin() /app/public/wp-admin/plugins.php:43
PHP   3. include_once() /app/public/wp-admin/includes/plugin.php:555

PHP Notice:  Trying to get property 'prefix' of non-object in /app/public/wp-content/plugins/ultimate-wp-mail/Main.php on line 17
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. activate_plugin() /app/public/wp-admin/plugins.php:43
PHP   3. include_once() /app/public/wp-admin/includes/plugin.php:555

PHP Notice:  Undefined variable: wpdb in /app/public/wp-content/plugins/ultimate-wp-mail/Main.php on line 18
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. activate_plugin() /app/public/wp-admin/plugins.php:43
PHP   3. include_once() /app/public/wp-admin/includes/plugin.php:555

PHP Notice:  Trying to get property 'prefix' of non-object in /app/public/wp-content/plugins/ultimate-wp-mail/Main.php on line 18
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. activate_plugin() /app/public/wp-admin/plugins.php:43
PHP   3. include_once() /app/public/wp-admin/includes/plugin.php:555

PHP Notice:  Undefined variable: wpdb in /app/public/wp-content/plugins/ultimate-wp-mail/Main.php on line 19
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. activate_plugin() /app/public/wp-admin/plugins.php:43
PHP   3. include_once() /app/public/wp-admin/includes/plugin.php:555

PHP Notice:  Trying to get property 'prefix' of non-object in /app/public/wp-content/plugins/ultimate-wp-mail/Main.php on line 19
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. activate_plugin() /app/public/wp-admin/plugins.php:43
PHP   3. include_once() /app/public/wp-admin/includes/plugin.php:555

PHP Deprecated:  Function create_function() is deprecated in /app/public/wp-content/plugins/ultimate-wp-mail/Functions/EWD_UWPM_Widgets.php on line 67
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. activate_plugin() /app/public/wp-admin/plugins.php:43
PHP   3. include_once() /app/public/wp-admin/includes/plugin.php:555
PHP   4. include() /app/public/wp-content/plugins/ultimate-wp-mail/Main.php:260

PHP Deprecated:  Function create_function() is deprecated in /app/public/wp-content/plugins/ultimate-wp-mail/Functions/EWD_UWPM_Widgets.php on line 67
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. require_once() /app/public/wp-admin/plugins.php:10
PHP   3. require_once() /app/public/wp-admin/admin.php:31
PHP   4. require_once() /app/public/wp-load.php:37
PHP   5. require_once() /app/public/wp-config.php:114
PHP   6. include_once() /app/public/wp-settings.php:305
PHP   7. include() /app/public/wp-content/plugins/ultimate-wp-mail/Main.php:260

PHP Notice:  update_usermeta is <strong>deprecated</strong> since version 3.0.0! Use update_user_meta() instead. in /app/public/wp-includes/functions.php on line 3853
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. require_once() /app/public/wp-admin/plugins.php:10
PHP   3. require_once() /app/public/wp-admin/admin.php:31
PHP   4. require_once() /app/public/wp-load.php:37
PHP   5. require_once() /app/public/wp-config.php:114
PHP   6. do_action() /app/public/wp-settings.php:450
PHP   7. WP_Hook->do_action() /app/public/wp-includes/plugin.php:453
PHP   8. WP_Hook->apply_filters() /app/public/wp-includes/class-wp-hook.php:310
PHP   9. EWD_UWPM_User_Last_Activity() /app/public/wp-includes/class-wp-hook.php:286
PHP  10. update_usermeta() /app/public/wp-content/plugins/ultimate-wp-mail/Main.php:208
PHP  11. _deprecated_function() /app/public/wp-includes/deprecated.php:2319
PHP  12. trigger_error() /app/public/wp-includes/functions.php:3853

PHP Notice:  update_usermeta is <strong>deprecated</strong> since version 3.0.0! Use update_user_meta() instead. in /app/public/wp-includes/functions.php on line 3853
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. require_once() /app/public/wp-admin/plugins.php:10
PHP   3. require_once() /app/public/wp-admin/admin.php:31
PHP   4. require_once() /app/public/wp-load.php:37
PHP   5. require_once() /app/public/wp-config.php:114
PHP   6. do_action() /app/public/wp-settings.php:450
PHP   7. WP_Hook->do_action() /app/public/wp-includes/plugin.php:453
PHP   8. WP_Hook->apply_filters() /app/public/wp-includes/class-wp-hook.php:310
PHP   9. EWD_UWPM_User_Last_Activity() /app/public/wp-includes/class-wp-hook.php:286
PHP  10. update_usermeta() /app/public/wp-content/plugins/ultimate-wp-mail/Main.php:209
PHP  11. _deprecated_function() /app/public/wp-includes/deprecated.php:2319
PHP  12. trigger_error() /app/public/wp-includes/functions.php:3853

PHP Notice:  Undefined variable: Custom_Element_Object in /app/public/wp-content/plugins/ultimate-wp-mail/Functions/uwpm_register_custom_element_section.php on line 23
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. require_once() /app/public/wp-admin/plugins.php:10
PHP   3. require_once() /app/public/wp-admin/admin.php:31
PHP   4. require_once() /app/public/wp-load.php:37
PHP   5. require_once() /app/public/wp-config.php:114
PHP   6. do_action() /app/public/wp-settings.php:450
PHP   7. WP_Hook->do_action() /app/public/wp-includes/plugin.php:453
PHP   8. WP_Hook->apply_filters() /app/public/wp-includes/class-wp-hook.php:310
PHP   9. EWD_UWPM_Allow_Custom_Element_Registration() /app/public/wp-includes/class-wp-hook.php:286
PHP  10. do_action() /app/public/wp-content/plugins/ultimate-wp-mail/Main.php:36
PHP  11. WP_Hook->do_action() /app/public/wp-includes/plugin.php:453
PHP  12. WP_Hook->apply_filters() /app/public/wp-includes/class-wp-hook.php:310
PHP  13. EWD_UWPM_Register_WC_Elements_Section() /app/public/wp-includes/class-wp-hook.php:286
PHP  14. uwpm_register_custom_element_section() /app/public/wp-content/plugins/ultimate-wp-mail/Functions/EWD_UWPM_Register_WooCommerce_Custom_Elements.php:23

PHP Notice:  Undefined index: EWD-UWPM-Options in /app/public/wp-content/plugins/ultimate-wp-mail/Main.php on line 56
PHP Stack trace:
PHP   1. {main}() /app/public/wp-admin/plugins.php:0
PHP   2. require_once() /app/public/wp-admin/plugins.php:10
PHP   3. require() /app/public/wp-admin/admin.php:140
PHP   4. require_once() /app/public/wp-admin/menu.php:294
PHP   5. do_action() /app/public/wp-admin/includes/menu.php:149
PHP   6. WP_Hook->do_action() /app/public/wp-includes/plugin.php:453
PHP   7. WP_Hook->apply_filters() /app/public/wp-includes/class-wp-hook.php:310
PHP   8. EWD_UWPM_Enable_Menu() /app/public/wp-includes/class-wp-hook.php:286