Mousedrop fixes - Adds return value to item mousedrop and fixes current bugs with the few things that make use of it

code/modules/clothing/clothing.dm

@@ -62,7 +62,7 @@
 	if(ismecha(M.loc)) // stops inventory actions in a mech
 		return
 
-	if(!M.incapacitated() && loc == M && istype(over_object, /obj/screen/inventory/hand))
+	if(!. && !M.incapacitated() && loc == M && istype(over_object, /obj/screen/inventory/hand))
 		var/obj/screen/inventory/hand/H = over_object
 		if(M.putItemFromInventoryInHandIfPossible(src, H.held_index))
 			add_fingerprint(usr)

code/modules/paperwork/paper_cutter.dm

@@ -92,6 +92,8 @@
 
 /obj/item/papercutter/MouseDrop(atom/over_object)
 	. = ..()
+	if(.)
+		return
 	var/mob/M = usr
 	if(M.incapacitated() || !Adjacent(M))
 		return

code/modules/paperwork/paperbin.dm

@@ -42,6 +42,8 @@
 
 /obj/item/paper_bin/MouseDrop(atom/over_object)
 	. = ..()
+	if(.)
+		return
 	var/mob/living/M = usr
 	if(!istype(M) || M.incapacitated() || !Adjacent(M))
 		return