FormattedTextBlock handling long words

[quinkennedy]

I noticed on the inside cover, the hash-tag is wrapped mid-word. This is perhaps not preferred, but it is probably better than letting the hashtag run off the edge of the page.

FormattedTextBlock would currently let it run off the edge of the page. Also, the FTB.maxWidth does not report the actual width, it might be better to call it constrainWidth to match the Height variables.

In any case, there are two different tasks. It would be good to decide which ones (or none) we want to do for initial zine release:

1. have FormattedTextBlock keep track of actual width, and re-size font size if a word is too long for a line.
2. have FormattedTextBlock wrap mid-word if the word is too long for the line.