Merge pull request #11244 from Arkatos1/Action_Tooltip

Descriptions now show with a mouse hover over action buttons

code/datums/action.dm

@@ -23,6 +23,8 @@
 	button = new
 	button.linked_action = src
 	button.name = name
+	if(desc)
+		button.desc = desc
 
 /datum/action/Destroy()
 	if(owner)
@@ -82,6 +84,7 @@
 	if(button)
 		button.icon = button_icon
 		button.icon_state = background_icon_state
+		button.desc = desc
 
 		ApplyIcon(button)
 
@@ -434,6 +437,7 @@
 	var/obj/effect/proc_holder/spell/S = target
 	S.action = src
 	name = S.name
+	desc = S.desc
 	button_icon = S.action_icon
 	button_icon_state = S.action_icon_state
 	background_icon_state = S.action_background_icon_state