stb_truetype: Cancel out phase offset from box filter correctly.
stb_rect_pack.h: Impl must include assert.h
stb_truetype: Negative size = pixels for EM square.
stb_truetype: Fix implicit conversion warnings.
stb_rect_pack: Fix implicit conversion warnings.
stb_truetype:
   STBTT_POINT_SIZE
   documentation for above

stb_rect_pack:
   STBRP_ASSERT
update version numbers
Merge branch 'oversample_shift' of https://github.com/rygorous/stb
fix use of stbrp_coord if no stb_rect_pack;
fix a few assert()s that weren't STBTT_asserts();
fix missing cast for C++
fix typo in C++ test compilation that prevented it from trying to compile stb_truetype
update version number