This implements the SDL_rect.h interface, except for SDL_EnclosePoints()
and SDL_IntersectRectAndLine(), which need some features cl-autowrap
doesn't have yet. The API was made somewhat lispy, but not overly so.
I tried to avoid unnecessary memory allocations in the codes.
Performed code changes as per review of rpav. Added WITH-POINTS such
that it is similar to WITH-RECTS.
Merge branch 'master' of https://github.com/psilord/cl-sdl2 into psilord-master

Conflicts:
	sdl2.asd

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The conflict was that I had modified sdl2.asd to include joystick and gamecontroller