SDL2 input: compilation fixed
Removed custom Carbon message pump
SDL2 input: seems to work on OS X, has some input issues though
We don't need Carbon on OS X anymore
Removed obsolete OIS workaround
Merge remote-tracking branch 'corristo/sdl_input2' into sdl_input2
Mouse grab and relative input need to be disabled when the mouse leaves the window; Disabled resolution switching / window resizing for now due to several glitches