- moved SDL_WinRTApp.* from src/video/windowsrt/ to src/core/winrt/, and renamed them to SDL_winrtapp.* (to mimick case-sensitivity used elsewhere in SDL)
- renamed all "windowsrt" directories (in src) to "winrt", as the shorthand name is used more often (and, IMO, "WinRT" != "Windows RT", not entirely at least)
--HG--
rename : src/video/windowsrt/SDL_WinRTApp.cpp => src/core/winrt/SDL_winrtapp.cpp
rename : src/video/windowsrt/SDL_WinRTApp.h => src/core/winrt/SDL_winrtapp.h
rename : src/core/windowsrt/SDL_winrtpaths.cpp => src/core/winrt/SDL_winrtpaths.cpp
rename : src/video/windowsrt/SDL_winrtevents.cpp => src/video/winrt/SDL_winrtevents.cpp
rename : src/video/windowsrt/SDL_winrtevents_c.h => src/video/winrt/SDL_winrtevents_c.h
rename : src/video/windowsrt/SDL_winrtmouse.cpp => src/video/winrt/SDL_winrtmouse.cpp
rename : src/video/windowsrt/SDL_winrtmouse.h => src/video/winrt/SDL_winrtmouse.h
rename : src/video/windowsrt/SDL_winrtvideo.cpp => src/video/winrt/SDL_winrtvideo.cpp
rename : src/video/windowsrt/SDL_winrtvideo.h => src/video/winrt/SDL_winrtvideo.h