SDL2 window creation works - but is missing many features
Fixes / Updates
-Fix for keyboard events not firing right
-Fix mouse button handling
-Remove winMain in favor of SDL main
-Add some _WIN32 specific defines
-Update libjpeg to version 8
-Build against multithreaded DLL libraries
-Fixed issue prevent xinput code path from working
-Moved swap interval to SDL
-Fixed for gamma
Fixes for build environment
SDL2 related cleanup and fixes
-No longer directly set gamma ramp (use SDL2_SetWindowBrightness instead)
-Fix issue with window not being visible after mode change
-Restore alt-enter to toggle fullscreen
-Restore ability to set window position correctly