in progress new API
separate filter for horizontal and vertical
Merge branch 'resample2' into resample

Conflicts:
	stb_image_resize.h
in-progress refactoring
new API "finished" but untested
new API partially in-use
tweak new API, get it partly working
STBIR_EDGE_ZERO
finish STBI_EDGE_ZERO, untested
tweak new API
rename alpha gamma flag
refactor internal interfaces to avoid passing things multiple times;
finish prepping 'stbir__info' even before calculate_memory;
get rid of 'noinfo' functions since now calculate_memory doesn't need 'em;
add new binary-searched sRGB function (untested)
inline stbir__encode_pixel into stbir__encode_scanline
Merge pull request #3 from nothings/resample

Resample