Use standard CFF encoding.

AFAIK the CFF encoding is only useful for characters from 0-255. Inspecting some other CFF fonts show that they use standard encoding and just use cmap to encode characters, so that's what we'll do as well.
Don't parse the cmap terminator segment.
Correct calculation of searchRange.
Read-write script uses all glyphs.

Before, it just took the first 100.