remove STBIR__DEBUG_ASSERT because it requires defining/not-defining assert() in a warning-free way on all platforms independent of #include <assert.h>, which is too hard

Slightly modify the public domain license to keep it in the public domain, but make it clear that even when dedications might not be recognized that the code is still usable.  Given that this isn't dual-licensing under a different license, I'm hoping this will be acceptable.

Update links for par_shapes, fastlz

Slightly modify the public domain license to keep it in the public domain, but make it clear that even when dedications might not be recognized that the code is still usable.  Given that this isn't dual-licensing under a different license, I'm hoping this will be acceptable.

Add support for obtaining the entire kerning table from a font all at once, for use in rendering packed textures offline.

other_libs.md: Update Picol