quickslot works, new event for actor "actorValueChanged"

- "unpacking" fresh new tool would un-register quickslot desig.
- priority issue on "equipped by quickslot change" and "equipped by inventory UI"

src/net/torvald/terrarum/Terrarum.kt

@@ -50,8 +50,6 @@ object Terrarum : StateBasedGame(GAME_NAME) {
     val HALFH: Int
         get() = HEIGHT.ushr(1)
 
-    val QUICKSLOT_MAX = 10
-
     /**
      * To be used with physics simulator
      */