Need to be able to retrieve the recent changes for an object
Add the property manager to the game object. Change the first property (the demo ObjectDetails property) to use the new system
Oops, fix test that was failing due to the changes in the way the MTV is calculated
Change the basic property updating tests to use the new style of properties
FIx dumb bug that would have been caught by the type checker if watchify didn't return any
Use the new property system during a tick (fixes most of the test failures with the new system)