The warning concerns the return value of stbi_err, which is an int, being converted to a pointer. In VS2015 it seems casting directly from a 32-bit int to a 64-bit pointer triggers this warning. Worked around by first converting to a 64-bit int (here size_t) and then to a pointer.

fix a few crash bugs with invalid stb_vorbis files (reported by Philip Bennefall, found using a fuzz tester)

test program for seeking (stb)

actually want

allow discontinuous codepoints in PackFontRanges;
fix bug in GetFontOffsetForIndex (non-0 index never worked?);
tweak public domain license

Conflicts:
	stb_voxel_render.h

fixed the typo in stbtt_GetFontOffsetForIndex, where the field size should be 4 instead of 14.