Adjusted makefile to work with both clang and msvc on win32
Removed "WIN32", use the standard _WIN32 instead
Fixed bad VectorCopy's
Use qvec4b instead of special color_rgba type
qvec now follows built-in type procedures for handling operators; this means that (qvec3i + qvec3f) will now properly produce a float, as one would expect, instead of adding the float to the integers without casting to the common type.
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