@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.
It's a getter that delegates to another member, ie. it's not a simple getter.