Handle objective value changes. Although the client *shouldn't* be using this for any sort of keying, it may indeed be. Closes #1116 awaiting testing.

api/src/main/java/net/md_5/bungee/api/score/Objective.java

@@ -1,11 +1,13 @@
 package net.md_5.bungee.api.score;
 
+import lombok.AllArgsConstructor;
 import lombok.Data;
 
 /**
  * Represents an objective entry.
  */
 @Data
+@AllArgsConstructor
 public class Objective
 {
 
@@ -16,7 +18,7 @@ public class Objective
     /**
      * Value of the objective.
      */
-    private final String value;
+    private String value;
     /**
      * Type; integer or hearts
      */

api/src/main/java/net/md_5/bungee/api/score/Scoreboard.java

@@ -74,6 +74,11 @@ public class Scoreboard
         return teams.get( name );
     }
 
+    public Objective getObjective(String name)
+    {
+        return objectives.get( name );
+    }
+
     public void removeObjective(String objectiveName)
     {
         objectives.remove( objectiveName );

proxy/src/main/java/net/md_5/bungee/connection/DownstreamBridge.java

@@ -119,7 +119,11 @@ public class DownstreamBridge extends PacketHandler
                 serverScoreboard.removeObjective( objective.getName() );
                 break;
             case 2:
-                // TODO: Handle this if we ever make an API
+                Objective oldObjective = serverScoreboard.getObjective( objective.getName() );
+                if ( oldObjective != null )
+                {
+                    oldObjective.setValue( objective.getValue() );
+                }
                 break;
             default:
                 throw new IllegalArgumentException( "Unknown objective action: " + objective.getAction() );