Moved collision/physics information into manifest, made real mouse cursor always invisible and use 'virtual' cursor when needed.

lib/managers/entity_manager.rb

@@ -1,7 +1,7 @@
 class IMICFPS
   module EntityManager # Get included into GameState context
     def add_entity(entity)
-      @collision_manager.add(entity)# Add every entity to collision manager
+      @collision_manager.add(entity) if entity.manifest.collision# Add every entity to collision manager
       Publisher.instance.publish(:create, nil, entity)
       @entities << entity
     end
@@ -22,7 +22,7 @@ class IMICFPS
     def remove_entity(entity)
       ent = @entities.detect {|entity| entity == entity}
       if ent
-        @collision_manager.remove(entity)
+        @collision_manager.remove(entity) if entity.manifest.collision
         @publisher.publish(:destroy, nil, entity)
         @entities.delete(ent)
       end