Make behaviour of characters with problematic width configurable

Add a profile option to follow Unicode standard for the display width of
characters, where this width differs from glibc's wcwidth.

Currently the only character affected by this is soft hyphen (unicode 0x00ad).

Konsole generally follows wcwidth() function when determining the display
width of characters, since this is behaviour expected by libreadline, and
doing otherwise corrupts lines containing problematic characters. When such
characters are used more for display, then on the command line, following
the Unicode standard may be prefferable.

The default for this option is disabled - that is follow wcwidth().

CCBUG: 464823