Convert image 4.7

Convert image v3.7 changes:

Improved corrupt image error handling.

Convert image v3.6 changes:

Fixed issue with strpos empty needle.

Convert image v3.5 changes:

Added Exclude domain to options page.

Convert image v3.4 changes:

Added support for $config['http']['proxy'] in order to allow hiding IP address.

Convert image v3.3 changes:

Code refactoring update.

Convert image v3.2 changes:

No longer requires a specific image handler. File system operations now using XenForo file functions.

Convert image v3.1 changes:

Fixed issue with undefined variable in previous version.

Convert image v3.0 changes:

Using XF HTTP client for requests. Now bypasses animated GIF's with over 100 frames.

Convert image v2.9 changes:

Added error message if allow_url_fopen is not enabled.

Convert image v2.8 changes:

Fixed function that deletes temporary files if option is selected.