Changed the boatType attribute from all around the place from String lit to enum

#story[1274]

src/main/java/seng302/visualiser/controllers/cells/PlayerCell.java

@@ -31,7 +31,7 @@ public class PlayerCell {
         this.playerId = playerId;
         this.name = yacht.getBoatName();
         this.boatColor = yacht.getColour();
-        this.boatType = BoatMeshType.getBoatMeshType(yacht.getBoatType());
+        this.boatType = yacht.getBoatType();
     }
 
     public void initialize() {

src/main/java/seng302/visualiser/controllers/dialogs/BoatCustomizeController.java

@@ -111,8 +111,8 @@ public class BoatCustomizeController implements Initializable{
         this.lobbyController = lobbyController;
     }
 
-    public void setCurrentBoat(String boatType) {
-        currentBoat = BoatMeshType.getBoatMeshType(boatType);
+    public void setCurrentBoat(BoatMeshType boatType) {
+        currentBoat = boatType;
         displayCurrentBoat();
     }