Rejigging Item slots (#4933)

* itemslot overhaul

* remove "shared" prefix

* handle component shutdown

* comments, cleanup, tests

* comments and minor tweak

* rename ItemSlotManagerState

* fix swapping

* fix merge

* Add ItemSlot verb text override

* fix merge  (IEntity -> entityUid)

* Fix merge (LabelSystem)

* Fix merge (nuke disk)

* fix test

Resources/Locale/en-US/containers/item-slots-component.ftl

@@ -1,4 +1,2 @@
-item-slots-try-insert-no-hands = You have no hands.
-
-# EjectItemVerb
-eject-item-verb-text-default = Eject {$item}
+take-item-verb-text = Take {$subject}
+place-item-verb-text = Place {$subject}