Compile fix for new Xcode
Update Freetype binaries for iOS (others are statically linked in normal binary)
Bitmap premultiplied-alpha fix
Fix drawTiles() alpha, using premultiplied alpha
Better fix for drawTiles, using premultiplied alpha
Change some other shaders for premultiplied alpha
Revert previous commit, may be unneeded
Got SDL2 initially working on Windows
Improvements to SDL2 stage
Can't link SDL2_mixer for now, using OpenAL