@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.
We have very many labels in Eigen that are like this one, like a label for an auction price with bid. This is just one oddball that happens to have been coded inside ARLabelSubclasses. How about we delete it from here and when we want to port generic artwork views into their own library?