Handle additional format ranges when itemizing.

Handle additional format ranges when itemizing.

This is useful when the additional formats are used on a
text layout using a raw font. It can also come in handy for
input methods operating on a QTextDocument.
We now consider all format range edges to generate the
associated items. The capitalization can be overridden via
the additionnal formats mechanism.

Adds an autotest that checks that this works with font capitalization.

Change-Id: I782d2c48d05b0dfbad480a9ca77198465292b358
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>