deprecate self.jump and add mobs.compatibility_check function.

compatibility.lua

@@ -0,0 +1,8 @@
+
+-- called after mob registration to check for older settings
+
+function mobs.compatibility_check(self)
+
+	-- simple mobs rotation setting
+	if self.drawtype == "side" then self.rotate = math.rad(90) end
+end