- Made termstr's length match the on-screen width.
- Achieved by adding a zero width character after each wide
character.
- This fixes ljust and rjust, so that there is correct padding,
otherwise Portal appearances aren't the correct width.
- When getting a sub-string containing half a wide character,
the half character is a space.
- Some wide characters are still broken. e.g. country flags
Andrew Hamilton
c91beda9b4