Refactor to remove the property "MyScene" and the pointless circular
refs to the managing classes. Converted the module to a non-shared module.
Reformatted source for 80 columns. Removed the special role the module
had in the old loader.
This means moving the alert up to a place where the IClientAPI is available.
One can also argue that such client messages shouldn't be sent directly from the scene data model
This may break a lot of things, but it needs to go in. It was tested in standalone and the UCI grid, but it needs a lot more testing.
Known problems:
* HG asset transfers are borked for now
* missing texture is missing
* 3 unit tests commented out for now
