Completed radio mode filter.
Minor changes.

Added some TODOs.
Added default dipole gain.
Added subscription for interface changes.
Removed BITERROR and COLLISION message kinds from packets sent up by radio.

Replaced with setBitError/hasBitError.
This removed the distinction, but it wasn't clear/used anyway.
Fixed destructor.
Removed unused parameter.
Renamed to IPhysicalLayerControlInfo.
Replaced old PhyControlInfo with RadioControlInfo.
Extracted reception indication from decision.