fix for possible exception in conveyor sorter terminal controls on world init

Fix for soft-crash in ClientSensorLogic.cs::UpdateFromNetwork()

Add small grid IFF reflector, set component cost for large IFF reflector

Fix for crash in countermeasure packets

Remove extraneous logging in BlockSelectControl.cs

Fix exception in GlobalData.cs::ClientMessageHandler() related to not always unregistering network message handlers.

Fix crash in SensorControls.cs::HasMovement, fix searcher not respecting AllowMechanicalControl on sensor add

Fix for nonfunctional search and track blocks on DS

Remove extraneous logging

Framework for comms sensors