Merge pull request #1038 from lakkatv/lakka

(Lakka) Move tweening related functions in an external lib
Split up check_movie_record into check_movie_init and check_movie_record
Refactor check_movie_record code some more
Added menu button Y
Added generic message buffer and open_compressed flag to menu_driver
Added toggle button to open zip files in load content and detect core
Refactor check_enter_menu
Add tween.c to griffin.c
Move this to the bottom for consistency with the other null drivers.
Merge branch 'master' of github.com:libretro/RetroArch
(Apple) iOS Xcode 6 build fix
File.c now autoextracts in case of need_fullpath
Zipfiles open or run half finished
Failsafe in case extraction dir is wrong
Always interpret files as carchives in case of detect_core_list to allow browsing them.
Choosing whether to open or load a zip file in detect core should work now
Removed MENU_ACTION_Y, small bugfix with selections in zip select
iOS: Directly synthsize RAMenuItemBasic properties

On iOS, when properties are not explicitly synthesized in their implementation, the compiler will attempt to do something that is called "autosynthesis", which is essentially it synthesizing the properties for you. However this problem with this is that it can trip up the compiler if you have a subclass of a base class that has a property with the same name as one in the base class.

Also consider how properties work. Say we have a property like so:

@property int someVar;

This is telling the compiler to make a getter and a setter for a class member variable named someVar which is of type int. So the following functions will be created.
+(int) someVar(), which is the getter.
+(void) setSomeVar:(int) var, which is the setter.

In this case, RAMenuItemBasic inherits from NSObject, which already has a function named "description", yet we were trying to generate a getter/setter for our own variable named that, which leads to clashing. This is why the property was never being synthesized correctly. Directly declaring the synthesizing calls ourself fixes this.
Merge pull request #1040 from lioncash/ios-fix

iOS: Directly synthsize RAMenuItemBasic properties
Add stub functions for get_video_driver in frontends