Added EncoderFactory. This creates specific MessageEncoders. Supports JoinAcceptance and RequestToJoin.
Added MessageEncoder interface.
Added JoinAcceptanceEncoder.
Added encode(AC35Data) function to RaceVisionByteEncoder.
Added RequestToJonEncoder.
Updated RequestToJoin and JoinAcceptance decode/encode tests to use the above.
issue #35#36
#story[1095]
Moved Boat/MockBoat/VisualiserBoat into it.
Moved Polars, polarParser, VMG, and polar exception.
Moved the networking stuff into it.
Moved angle, azimuth, bearing into it.
Moved gpscoordinate into it.
Moved mark/compoundMark into it.
Moved leg into it.
Moved trackpoint into it.