Replaced loc setting with forceMove. (#11490)

* Replaced loc setting with forceMove.

* Update forceMove to permit moving to null loc.

Also fixed atom locking with offsets not following properly.

code/modules/games/cards/playing_cards.dm

@@ -121,7 +121,7 @@
 				for(var/obj/item/toy/singlecard/card in C.currenthand)
 					if(card.flipped == 0)
 						card.Flip()
-					card.loc = src
+					card.forceMove(src)
 					cards += card
 				user.visible_message("<span class = 'notice'>[user] puts their hand of cards into the deck.</span>",
 									 "<span class = 'notice'>You put the hand into the deck.</span>")

code/modules/games/cards_html.dm

@@ -176,7 +176,7 @@
 	ASSERT(H)
 
 	usr.visible_message("\The [usr] plays \the [card.name].")
-	H.loc = get_step(usr,usr.dir)
+	H.forceMove(get_step(usr,usr.dir))
 
 	src.update_icon()