Bugfix: Codepoint to Binary is not working.

Bugfix: Codepoint to Binary is not working.

The wrong variable is being processed.
The codepoint (which is the Unicode representation, such as U+8C78 the codepoint is for the character '豸') is being width checked.
The binary character is what should be getting the width check.

A second situation where the codepoint is not being printed at all is with the files.
It seems that I forgot to finish writing this code (another problem caused by my original accidental commit of this project).

While investigating this I saw some opportunity for some cleanup.
- Move the width detection into a separate function utf8_process_text_width().
- Use character.string[0] instead of *character.string.
- Rename 'character' to 'current' to make more semantic sense (At the time I wasn't sure what to call it and 'text' was already unavailable).
- The 'text' in private-utf8_codepoint.c is now initialized in a simpler way.