* Renames MiniRegionModule to MRMModule to make it more distinct from the actual Mini Region Module[s] executed in Scene.
* Renames MiniRegionModuleBase to MRMBase for convenience. MRM's need to be adjusted to inherit from MRMBase.
This changeset add the RegionReady module code. The module sends a
message on a configurable channel when an oar file has finished
loading or if the script engine has emptied its queue for the first
time (eg server startup). Config is something like this:
[RegionReady]
enabled = true
channel_notify = -800
The module also knows if there was an error with startup.
