Implements an Add-on Loader so that other add-ons, such as the FFZ Add-on Pack, can be loaded directly by FFZ without requiring the user to install multiple extensions into their browser.
* Fixed: Scrolling issue with the FFZ Control Center when using certain controls.
* Fixed: Visibility checkboxes in the In-Line Chat Actions editor not working correctly when multiple actions are in edit mode.
* Added: Social media buttons to the FFZ Control Center.
* Fixed: Check boxes in settings UI.
* Fixed: Use word wrap for usernames in grouped mass gift sub messages.
* Fixed: Bug with tab completion breaking chat if Twitch's tab completion handler returns null.
* Fixed: Loading errors in the Browse Popular directory due to a renamed query field.
* Fixed: Block and Hide Thumbnail buttons not appearing in Game directories. (Fixes#538)
* Fixed: Custom chat width applying when portrait mode is active. (Fixes#540)
* Fixed: FrankerFaceZ not properly detecting the dark theme when theater mode is enabled and then not using appropriate colors. (Fixes#541)
* Fixed: Override badges appearing invisible with certain badge styles.
* Maintenance: Update the chat types enum to match current Twitch values.
* Fixed: Merge User and Room objects when ID and login are both known at once.
* Fixed: Spacing and sorting of metadata beneath the player. (Closes %520)
* Fixed: Update the settings menu when new settings are added while the menu is open. (Closes#523)
* Fixed: Do not maximize or minimize the settings window when double-clicking in the search box. (Closes#521)
