Backup
Update RdInputManager to use new Singleton paradigm

RdSDLInputManager now needs to be registered beforehand, to be later used.
RdKeyboardManager is now gone, as for SDL is better to get all the input
events in the same thread.
Remove old files reference, add listeners to CMakeLists.txt
Merge branch 'singletonMess'

Conflicts:
	src/libraries/RdInputLib/CMakeLists.txt