Master fix muon track cleaner
Fixes for MuonTrackCleaner and MuonErrorOptimisationTool for thread safety
- Add explicit thread safety checks to MuonTrackCleaner, and MuonErrorOptimisationTool (because other tools in this package need more work)
- MuonTrackCleaner: Move to new GAUDI way to declare properties and all tools now private
- Counters to atomic
- MuonErrorOptimisationTool: copy track summary rather than const casting it