fix internal names to be namspaced properly;

Conflicts:
	stb_image_write.h

Conflicts:
	README.md

fix spelling of "Hofmann" -- doh

Interesting factoid: my last name has four valid spellings. In Germany, the one I use is apparently the most common, while the other spellings are typical in the United States.

tweak formatting of FAQ list

stb_textedit: end-of-line handling places cursor before newline
stb_truetype: avoid compiler warning due to local vars hiding local vars
readme: add list of one-file libs

fix divide by 0 for exactly-vertical edges;
fix possible divide by 0 for exactly-horizontal edges
add documentation for stbtt_Rasterize;

fix incorrect initialization of alpha channel for RGB PSD

- conversion from int to stbi_uc
- unused parameter