Remove media browser plugins

Code in media_theplatform_mpx_form_media_browser() suffers from critical performance issues with any medium to large amount of MPX files. The problem is that the form is unpaginated, which means it has to load *all* MPX videos. This means calling media_theplatform_mpx_get_all_mpx_videos(), which on our site returns about 27,000 records.

This then also means that for each MPX video, it individually does a file_load() on each one, which is horrible for performance. At the least, file_load_multiple() should be used, but even then, it should not be done for 27,000 files all at once.

I don't know what the solution is for fixing these media browser tabs, it just seems unfixable without any sort of actual pagination. I realized that once our MPX videos were injested as files, we could just use the normal Media browser tabs which are nicely paginated with AJAX and only load/display 50 at a time.

In the end I had to just completely disable the media browser tabs provided by media_theplatform_mpx:

/**
 * Implements hook_module_implements_alter().
 */
function mymodule_module_implements_alter(&$implementations, $hook) {
  if ($hook == 'media_browser_plugin_info') {
    unset($implementations['media_theplatform_mpx']);
  }
}