Add optional round-target billboard display

src/main/java/us/tss3/blockparty/config/ArenaConfig.java

@@ -15,6 +15,8 @@ public class ArenaConfig {
     private Location lobby;
     private Location spawn;
     private Location spectator;
+    private Location billboard;
+    private boolean billboardEnabled = true;
     private int[] pos1; // x,y,z block coords
     private int[] pos2;
 
@@ -84,6 +86,26 @@ public class ArenaConfig {
         this.spectator = spectator;
     }
 
+    public Location getBillboard() {
+        return billboard;
+    }
+
+    public void setBillboard(Location billboard) {
+        this.billboard = billboard;
+    }
+
+    public boolean isBillboardEnabled() {
+        return billboardEnabled;
+    }
+
+    public void setBillboardEnabled(boolean billboardEnabled) {
+        this.billboardEnabled = billboardEnabled;
+    }
+
+    public boolean hasBillboard() {
+        return billboard != null && billboardEnabled;
+    }
+
     public int[] getPos1() {
         return pos1;
     }