Bugfix: Improper IKI vocabulary position for when a quote is immediately to the left...

Bugfix: Improper IKI vocabulary position for when a quote is immediately to the left of the vocabulary name.

I distantly remember attempting to shorthand and optimize the logic to reduce the while loop usage.
This appears to have backfired in that I missed one of the possible conditions.

An example of this is the following bash command utilizing IKI substitution:
  echo "IKI Path is 'define:"PATH"'"

In the aboce string, the bug is claining the IKI variable is "'define".
The quote is not a word charcter, not a dash, and not a plus.
The IKI vocabulary is supposed to be "define".

Redesign this back to have the multiple loops.
While this is messier, it should be harder to make a logic mistake.

Cleanup some of the logic to not need the private_f_iki_seek_special() function.

Make sure the width is always calculated prior to calling the UTF aware string functions.

Update wording in iki.txt specification to make a little more sense.