render_template fails with read-only files

The render_template method in components/NetsPostsTemplateRenderer.php does not work when the WordPress source files are read-only. The fix is simple: change line 41 (remove the r+ access mode):

$h    = fopen( $template, 'r' );

This problem was also reported in:

• https://www.ads-software.com/support/topic/just-installed-getting-fatal-exception/
• https://www.ads-software.com/support/topic/admin-ui-settings-has-critical-php-error/