(excluded 64 bit warning fix commits 9ab58e3 and 116f5b2e for now)
git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1573 af15c1b1-3010-417e-b628-4374ebc0bcbd
~3x faster than stb_image_write and similar file size
git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@1467 af15c1b1-3010-417e-b628-4374ebc0bcbd