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/mock/model/RaceServer.java

@@ -133,9 +133,6 @@ public class RaceServer {
         }
 
 
-        //Convert wind direction and speed to ints. //TODO this conversion should be done inside the racestatus class.
-        int windDirectionInt = AC35UnitConverter.encodeHeading(race.getWindDirection().degrees());
-        int windSpeedInt = (int) (race.getWindSpeed() * Constants.KnotsToMMPerSecond);
 
         //Create race status object, and send it.
         RaceStatus raceStatus = new RaceStatus(
@@ -144,8 +141,8 @@ public class RaceServer {
                 race.getRaceId(),
                 race.getRaceStatusEnum(),
                 race.getRaceClock().getStartingTimeMilli(),
-                windDirectionInt,
-                windSpeedInt,
+                race.getWindDirection(),
+                race.getWindSpeed(),
                 race.getRaceType(),
                 boatStatuses);