* Move 'aim' to Model, and change the generated transforms to
match, no longer inverts everything for cameras. This is
because cameras are now 'defined' in world space, and the
system takes care of adjusting it at render time.
* Fix serialisation of camera/model, now each one identifies itself
so it can be relinked into the system properly.
* Fix tabs in the LuaEditor.
* Clean up Camera model.
* Remove Cameras list from the tree view, now cameras are in the