- Don't use int32_t/u_int32_t unless we must.
- Remove C++ single line comment delimeters that crept in.
- Remove defs pertaining to byte granularity 'ragged-edge' bitmasks.
- Move all declarations of per-depth initialization functions to rasops.h.
- Other minor cleanup.
character-cell boundaries != byte boundaries.
("width" (despite the poor name) should be computed based on the
*old* value of bg, not the *new* one.)
Fixes PR 8221.