EXT-4993 : Deleting an item from the COF in Inventory Floater keeps it worn

EXT-4997 : Centralize right-click menu options for delete/remove link
EXT-4998 : Automatically reject double separators from right click menu

Disabled/hid delete button from COF right-click menu, also means that trash icon is disabled.
Added generalized function to remove consecutive separators from right-click menu.
Made a minor cosmetic change to have all code duplication for adding "delete" menu item instead call a common function.