* Separated Admin Controller into a generic and extendable Base controller. Added Autoload for properly loading classes
* Implemented custom class loader to force lowercase
* Removed composer autoloader for classes
* Updates
* Ability to pass custom upload URL for files
* Added new onAdminCanSave event for 3rd party plugins
* Moved files upload GC in onOutputGenerated event
* Cleanup
* Moved autoloader so it is always registering
* Fixed onOutputGenerated event location
* Moved `taskRemoveFileFromBlueprint`, `taskRemoveMedia `, `canEditMedia` methods to admin base controller
* Allow to globally define `blueprint_type` and `file_url_remove` for the file field
* Moved `isMultilang()` into base controller
* Properly generate thumbnails in proportions for file fields
* Simplified execute restrictions with blacklist
