* working proof of concept for ntu request/flow
* ntu is now measured in Float rather than Int; adjusted the type declarations in ChatActor, as it was complaining
* added auto repair information for amenities; modified terminal working example to include periodic repair timer
* crude power state acknowledgement exchange between ntu silo and building, following by building and amenities; better management and control over auto-repair
* separated auto-repair from terminal control; resource silo publishes an appropriate power state message upon formal start-up
* various Damageble objects have been granted auto-repair; doors no longer report no event for intercepting unhandled messages
* documentation and comments; unit tests and integration tests for AmneityAutoRepair, ResourceSilo, and BuildingActor
* merge plus some fixes
* addition checks for auto-repairing cavern equipment and for auto-repairing un-owned equipment
