EXT-4492 : Deleting gestures from the wearing tab causes the viewer to crash

EXT-4660 : Can delete a bodypart from the COF through inventory view or WEARING tab delete key
EXT-4662 : remove leading separator from COF right-click menu
EXT-4633 : AppearanceSP trash button doesn't update enabled state correctly

Bunch of UI fixes related to the trash/delete functionality in InventoryFloater/SP and AppearanceSP "WEARING" tab.  The main idea is that we don't want to allow deletion of bodyparts and folder links from the COF by the user.