Added Knots <-> MMperSec conversions to AC35UnitConverter.

Removed redundant/unused conversions.
Documented all of the conversions, and renamed them to pack/unpackX, to match the API spec.
Updated/added some tests in AC35UnitConverterTest.
RaceStatus now contains a Bearing instead of a packed int bearing.
RaceStatus now contains wind speed in knots, instead of MMperSec packed.
This means that only RaceStatus decoder/encoder need to care about the bits-over-wire packed values.
issue #35 #36
#story[1095]

racevisionGame/src/main/java/network/MessageDecoders/RaceStatusDecoder.java

@@ -5,6 +5,8 @@ import network.Messages.BoatStatus;
 import network.Messages.Enums.RaceStatusEnum;
 import network.Messages.Enums.RaceTypeEnum;
 import network.Messages.RaceStatus;
+import network.Utils.AC35UnitConverter;
+import shared.model.Bearing;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -65,10 +67,12 @@ public class RaceStatusDecoder {
         long expectedStart = bytesToLong(expectedStartBytes);
 
         byte[] windDirectionBytes = Arrays.copyOfRange(encodedMessage, 18, 20);
-        int windDirection = bytesToInt(windDirectionBytes);
+        int windDirectionInt = bytesToInt(windDirectionBytes);
+        Bearing windDirection = Bearing.fromDegrees(AC35UnitConverter.unpackHeading(windDirectionInt));
 
         byte[] windSpeedBytes = Arrays.copyOfRange(encodedMessage, 20, 22);
-        short windSpeed = bytesToShort(windSpeedBytes);
+        int windSpeedInt = bytesToInt(windSpeedBytes);
+        double windSpeedKnots = AC35UnitConverter.unpackMMperSecToKnots(windSpeedInt);
 
         byte[] numberOfBoatsBytes = Arrays.copyOfRange(encodedMessage, 22, 23);
         int numberOfBoats = bytesToInt(numberOfBoatsBytes);
@@ -99,7 +103,7 @@ public class RaceStatusDecoder {
                 raceStatus,
                 expectedStart,
                 windDirection,
-                windSpeed,
+                windSpeedKnots,
                 raceType,
                 boatStatuses    );
     }