Refactor an Instance model out of the GameRunner

src/main/java/gg/malloc/defense/engine/GameRunner.java

@@ -4,6 +4,7 @@ import gg.malloc.defense.model.Arena;
 import gg.malloc.defense.model.Game;
 import gg.malloc.defense.model.Spawner;
 import gg.malloc.defense.model.Waypoint;
+import gg.malloc.defense.model.Instance;
 
 import net.md_5.bungee.api.chat.BaseComponent;
 import net.md_5.bungee.api.chat.ClickEvent;
@@ -20,6 +21,7 @@ import java.util.logging.Logger;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.Collection;
+import java.util.UUID;
 
 import org.bukkit.Bukkit;
 import org.bukkit.GameRule;
@@ -37,7 +39,7 @@ import org.bukkit.entity.Player;
 import org.bukkit.entity.Projectile;
 import org.bukkit.inventory.ItemStack;
 
-public class GameRunner {
+public class GameRunner implements Instance {
   GameState m_state;
 
   Arena m_arena;
@@ -53,14 +55,6 @@ public class GameRunner {
 
   Logger m_log;
 
-  public enum Stage {
-    Idle,
-    Warmup,
-    Countdown,
-    Playing,
-    GameOver
-  }
-
   TickTask m_fuseTask;
   TickTask m_countdownTask;
   TickTask m_lobbyReturnTask;
@@ -262,6 +256,12 @@ public class GameRunner {
     return true;
   }
 
+  UUID m_id = UUID.randomUUID();
+
+  public UUID getId() {
+    return m_id;
+  }
+
   public Collection<Player> getPlayers() {
     return m_players.getPlayers();
   }