ludus. Call game on create camera event when reading camera.

Remove pass index from load tree read camera method.
Add a call to game on create camera, in load tree read render pass, after creating a camera.
ludus. Add on display changed event.

This is a preparation step to add camera view changes in test game, in order to test display changes, or primary surface view changes.
Add on display changed callback to ingenium and game interface.
Add camera list to test game.
Implement on displaty changed in test game.