ludus. Fix a bug in access to game data in object.
ludus. Change to how objects are read from the tree.

Reading objects from the tree now follows the following sequence.
1) Create the object
2) Read object data from the game tree file
3) Call the game on create object method
4) Read other object content.
game_test. Updates to test game.

Update test game based on changes to the test game tree.
Store shader variables in object data.
Play the audio source in the first non root object on touch down.
Rotate the first non root object on device rotate.
Remvoe audio source and shader variables fiels from test game.