Clear game objects on plugin shutdown

As we receive new events from RegionTileManager now, properly clear
all cached game objects on plugin's shutdown

runelite-client/src/main/java/net/runelite/client/plugins/agilityplugin/AgilityPlugin.java

@@ -62,6 +62,12 @@ public class AgilityPlugin extends Plugin
 	@Getter
 	private AgilityOverlay overlay;
 
+	@Override
+	protected void shutDown() throws Exception
+	{
+		obstacles.clear();
+	}
+
 	@Override
 	public void configure(Binder binder)
 	{

runelite-client/src/main/java/net/runelite/client/plugins/barrows/BarrowsPlugin.java

@@ -91,6 +91,13 @@ public class BarrowsPlugin extends Plugin
 		return barrowsOverlay;
 	}
 
+	@Override
+	protected void shutDown()
+	{
+		walls.clear();
+		ladders.clear();
+	}
+
 	@Subscribe
 	public void onWallObjectSpanwed(WallObjectSpawned event)
 	{

runelite-client/src/main/java/net/runelite/client/plugins/blastfurnace/BlastFurnacePlugin.java

@@ -59,6 +59,12 @@ public class BlastFurnacePlugin extends Plugin
 	@Inject
 	private ConveyorBeltOverlay conveyorBeltOverlay;
 
+	@Override
+	protected void shutDown()
+	{
+		conveyorBelt = null;
+	}
+
 	@Provides
 	BlastFurnaceConfig provideConfig(ConfigManager configManager)
 	{

runelite-client/src/main/java/net/runelite/client/plugins/cannon/CannonPlugin.java

@@ -93,6 +93,14 @@ public class CannonPlugin extends Plugin
 		return cannonOverlay;
 	}
 
+	@Override
+	protected void shutDown() throws Exception
+	{
+		cannonPlaced = false;
+		myCannon = null;
+		cballsLeft = 0;
+	}
+
 	@Subscribe
 	public void onGameObjectSpawned(GameObjectSpawned event)
 	{

runelite-client/src/main/java/net/runelite/client/plugins/hunter/HunterPlugin.java

@@ -45,12 +45,12 @@ import net.runelite.api.GameState;
 import net.runelite.api.ObjectID;
 import net.runelite.api.Player;
 import net.runelite.api.Point;
-import net.runelite.api.queries.GameObjectQuery;
-import net.runelite.api.queries.PlayerQuery;
-import net.runelite.client.config.ConfigManager;
 import net.runelite.api.events.ConfigChanged;
 import net.runelite.api.events.GameObjectSpawned;
 import net.runelite.api.events.GameStateChanged;
+import net.runelite.api.queries.GameObjectQuery;
+import net.runelite.api.queries.PlayerQuery;
+import net.runelite.client.config.ConfigManager;
 import net.runelite.client.plugins.Plugin;
 import net.runelite.client.plugins.PluginDescriptor;
 import net.runelite.client.task.Schedule;
@@ -103,6 +103,15 @@ public class HunterPlugin extends Plugin
 		return Arrays.asList(trapOverlay, catchrateOverlay);
 	}
 
+	@Override
+	protected void shutDown() throws Exception
+	{
+		catchAtempts = 0;
+		catchSuccess = 0;
+		lastActionTime = Instant.ofEpochMilli(0);
+		traps.clear();
+	}
+
 	@Subscribe
 	public void onGameObjectSpawned(GameObjectSpawned event)
 	{

runelite-client/src/main/java/net/runelite/client/plugins/motherlode/MotherlodePlugin.java

@@ -109,6 +109,13 @@ public class MotherlodePlugin extends Plugin
 		return Arrays.asList(overlay, rocksOverlay, motherlodeSackOverlay);
 	}
 
+	@Override
+	protected void shutDown() throws Exception
+	{
+		veins.clear();
+		rocks.clear();
+	}
+
 	public MotherlodeSession getSession()
 	{
 		return session;

runelite-client/src/main/java/net/runelite/client/plugins/poh/PohPlugin.java

@@ -95,6 +95,12 @@ public class PohPlugin extends Plugin
 		overlay.updateConfig();
 	}
 
+	@Override
+	protected void shutDown() throws Exception
+	{
+		pohObjects.clear();
+	}
+
 	@Subscribe
 	public void updateConfig(ConfigChanged event)
 	{

runelite-client/src/main/java/net/runelite/client/plugins/roguesden/RoguesDenPlugin.java

@@ -73,6 +73,14 @@ public class RoguesDenPlugin extends Plugin
 	@Getter
 	private RoguesDenOverlay overlay;
 
+	@Override
+	protected void shutDown()
+	{
+		obstaclesHull.clear();
+		obstaclesTile.clear();
+		hasGem = false;
+	}
+
 	@Override
 	public void configure(Binder binder)
 	{

runelite-client/src/main/java/net/runelite/client/plugins/runecraft/RunecraftPlugin.java

@@ -92,6 +92,12 @@ public class RunecraftPlugin extends Plugin
 		abyssOverlay.updateConfig();
 	}
 
+	@Override
+	protected void shutDown() throws Exception
+	{
+		abyssObjects.clear();
+	}
+
 	@Subscribe
 	public void updateConfig(ConfigChanged event)
 	{