Add Catalyzer level

A centric level where wall boost mechanic is highly used.

godot/Scenes/Game.tscn

@@ -8,7 +8,7 @@
 
 [node name="Game" type="Node2D"]
 script = ExtResource( 3 )
-levelNames = [ "Square", "Lab", "Focus", "Atom", "template", "Corner" ]
+levelNames = [ "Square", "Lab", "Focus", "Atom", "template", "Corner", "Catalyzer" ]
 
 [node name="MainCamera" type="Camera2D" parent="."]
 current = true