Add startup and shutdown methods to DiscordPlugin

Add startup and shutdown methods that will update/reset the current
discord rich presence status

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

runelite-client/src/main/java/net/runelite/client/plugins/discord/DiscordPlugin.java

@@ -65,6 +65,19 @@ public class DiscordPlugin extends Plugin
 		return configManager.getConfig(DiscordConfig.class);
 	}
 
+	@Override
+	protected void startUp() throws Exception
+	{
+		updateGameStatus(client.getGameState(), true);
+	}
+
+	@Override
+	protected void shutDown() throws Exception
+	{
+		discordService.clearPresence();
+		discordState.reset();
+	}
+
 	@Subscribe
 	public void onGameStateChanged(GameStateChanged event)
 	{

runelite-client/src/main/java/net/runelite/client/plugins/discord/DiscordState.java

@@ -41,6 +41,16 @@ public class DiscordState
 	private DiscordPresence lastPresence;
 	private boolean needsFlush;
 
+	void reset()
+	{
+		lastQueue.clear();
+		lastEvent = null;
+		startOfAction = null;
+		lastAction = null;
+		lastPresence = null;
+		needsFlush = false;
+	}
+
 	void flushEvent(DiscordService discordService)
 	{
 		if (lastPresence != null && needsFlush)