Merge branch 'wind_arrow_direction_5' into 'master'

Wind arrow direction 5

This should fix the wind arrow direction.

The polars were actually backwards so wind was being simulated with: into wind = faster, away from wind = slower.

#### A.C:
- Downwind means the boat's bearing is aligned with the wind arrow.
- Upwind means the boat's bearing is facing directly into the wind arrow.
- Pressing the upwind key should turn the boat in the upwind direction.
- Pressing the downwind key should turn the boat in the downwind direction.
- Facing upwind should result in a boat speed of roughly 0kn.
- Facing downwind should result in non-zero boat speed (roughly 14kn with 12kn wind).


Fixes #51 

See merge request !45

racevisionGame/src/main/java/mock/model/NewPolars.java

@@ -32,7 +32,7 @@ public class NewPolars {
     public static void addPolars(double trueWindSpeed, Bearing trueWindAngle, double boatSpeed){
         double tws = trueWindSpeed;
         double bs = boatSpeed;
-        double twa = trueWindAngle.degrees();
+        double twa = trueWindAngle.degrees() + 180;
         if (!polars.containsKey(tws)){
             polars.put(tws, new TreeMap<>());
         }

racevisionGame/src/main/java/visualiser/Controllers/InGameLobbyController.java

@@ -321,7 +321,7 @@ public class InGameLobbyController extends Controller {
      * @param interval Countdown interval to check
      */
     private void countdownText(long interval){
-
+        countdownTenPane.setVisible(false);
         //Do nothing if 5 seconds or less to go
         if (interval <=5000){
             countdownTenPane.setVisible(false);