added registerEventHandler() and clearEventHandler() Engine functions with ag:: lua interfaces

git-svn-id: svn://anubis/anaglym/trunk@115 99a6e188-d820-4881-8870-2d33a10e2619

tests/cratestack.lua

@@ -32,5 +32,13 @@ function key_down_event(key)
             crates[cratenum] = nil
             cratenum = cratenum - 1
         end
+    elseif (key == "m") then
+        ag.registerEventHandler(mouse_moves, "mouse_motion")
+    elseif (key == "n") then
+        ag.clearEventHandler("mouse_motion")
     end
 end
+
+function mouse_moves(x, y, xrel, yrel)
+    ag.println("mouse_moves ", x, ", ", y)
+end