first working staircasing but barely

src/net/torvald/terrarum/gameactors/AVKey.kt

@@ -29,6 +29,9 @@ object AVKey {
     const val JUMPPOWER = "jumppower"
     const val JUMPPOWERBUFF = "$JUMPPOWER$BUFF"
 
+    /** Maximum height of a stair the actor can climb */
+    const val VERTSTRIDE = "vertstride"
+
     /** How much air jumping you can perform. 0 is same as 1. INT */
     const val AIRJUMPPOINT = "airjumppoint"
     /** How much air jumping you have performed before you run out of the point. INT */