Add more intelligent line breaks for tap legends

[caksoylar]

Currently tap legends are split to lines on spaces (and double spaces are converted to single and don't split). This causes some ugliness, especially with modifier functions where by default you have Ctl+ C forms. This renders OK on a tap legend due to splitting, but render as is in hold/shifted fields and it looks bad.

If we instead remove the space from modifier functions and split on word boundaries \b, we will have better visuals overall. This way, a string like Ctl+Shft+C can still be split like Ctl+Shift+/C, while still having no gaps in hold/shifted fields.

The idea is to still split on explicit spaces, then within each item, use textwrap.TextWrapper(width=something)._wrap_chunks(re.split(r'\b', text)) to get a further split to chunks. something can be draw_config.shrink_wide_legends since that's nominally the acceptable legend width inside a key. However this means that a value of 0 should disable the splitting along with the shrinking.