Added MarkRoundingEncoder.

Refactored MarkRoundingDecoder - it now implements MessageDecoder.
Tidied up MarkRounding - it is now documented and has getters. Also Created MarkRoundingBoatStatusEnum, MarkRoundingIDEnum, MarkRoundingSideEnum, MarkRoundingTypeEnum.
Added MarkRoundingDecoderTest.
issue #35 #36
#story[1095]

racevisionGame/src/main/java/network/BinaryMessageDecoder.java

@@ -189,8 +189,8 @@ public class BinaryMessageDecoder {
 
             case MARKROUNDING:
                 //System.out.println("Mark Rounding Message!");
-                MarkRoundingDecoder mrDecoder = new MarkRoundingDecoder(messageBody);
-                return mrDecoder.getMarkRounding();
+                MarkRoundingDecoder mrDecoder = new MarkRoundingDecoder();
+                return mrDecoder.decode(messageBody);
 
             case COURSEWIND:
                 //System.out.println("Course Wind Message!");