Fixed the networking imports.
Race now keeps a reference to its Race, Boat, and Regatta data sources.
VisualiserRace can be provided with new Race/Boat/Regatta data sources during runtime. Currently it updates boundary and legs with a new RaceDataSource, and marker boats with a new BoatDataSource.
RaceStatus can provide windspeed in knots in addition to mm/sec.
RaceDataSource now provides a list of participating boat sourceIDs instead of boats.
Added a RegattaDataSource interface.
Angle, Azimuth, Bearing and mutable - careful.
Boat has positionInRace.
CompoundMarks have an ID and name.
Marks can be moved (setPosition(...)).
Refactored Mock.Race, Visualiser.StreamedCourse, Visualiser.StreamedRace, into (shared) Race, MockRace, VisualiserRace.
VisualiserBoat has color.
Added xml and polar files into resources folder.
fjc40