Alpha 4

Main changes:

• added favorite support
• added searching and filtering support
• added support for calling scripts before launching a game and after returning from it
• video files no longer need the -video suffix
• added multiple gamepad support
• added gamepad analog navigation support
• translators no longer need to touch the source code to add new languages
• added confirmation dialog before shutdown and reboot
• added error messages when no games have been found and when the selected theme couldn't be loaded
• general ui improvements
• redesigned the settings menu
• added fullscreen support for desktop users
• added support for overriding the user's home directory
• general improvements, optimizations and bugfixes