Follows f8d2927748.
There is an issue with text-wrapping and word separators (aka spaces).
Because 0 A.D. collates the space after a word to the same TextCall, we
occasionally need to ignore it when considering line-wrapping, because
we don't want empty spaces on the right-side of right-aligned text.
However, the logic to handle this is currently broken and inconsistent.
The method introduced here uses the SFeedback structure to properly
report it and generalises the checks.
Note that multiples spaces are not collapsed in 0 A.D., and for
consistency the word-separator-collapsing behaviour is ignored.
Comments by: phosit, vlasdislavbelov
Fixes#6551
Differential Revision: https://code.wildfiregames.com/D4662
This was SVN commit r26915.
f4128208de