Added libCGTextureMapping.a target

• New CGTextureMapping static library target produces `libCGTextureMapping.a` for inclusion into other projects.
	» Requires only CoreFoundation and GLKit frameworks.
	» Compiles `CGTextureMapping.cpp` and copies `CGTextureMapping.h` as an include header.
	» Uses the same `Prefix.pch` (formerly `DrawInQuad-Prefix.pch`) as the DrawInQuad target.
	» Overrides project settings to never Build Active Architecture Only, and always build with `-Ofast` optimizations.