@1aurabrown => Fix italic label

* Removed `ARArtworkTitleLabel`, this is such a specific label to Eigen that it doesn't belong in a shared library.
* Instead of `[label setHidesChevron:YES]` use `label.chevronHidden = `, consistent with `chevronDelta` and returning the correct value.
* Instead of `[label setChevronDelta:...]` use `label.chevronDelta = `.

This will do bad things to the eigen build, will fix this next.
i'm with you and i asked orta about this when it was initially committed, but i think he would argue that we use and will continue to use the same formatted label and attributed string for titles in all apps. @orta thoughts?