Update SDL2 and move to using submodules #7
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Updates the SDL2 headers to the latest version which I've through converting them to submodules. The benefits of this being that only the .gitmodules file needs to be modified to update the sdl versions (as apposed to copy/pasting the header files from each SDL project). This does come at the drawback that all of the SDL project files are cloned down via the submodules however they are shallowly cloned (only the latest commit) and recursion is disabled.
Tested on windows. Not tested on Mac