runelite-client: add methods for externals (plugin-hub) (#2286)

* Merge pull request #/10524 from Trevor159/get-var

Add getVar methods for external plugins

* Add the mixins

* fix dumb yaml error

recommend https://yaml-online-parser.appspot.com/

Co-authored-by: Adam <adam@sigterm.info>

runelite-mixins/src/main/java/net/runelite/mixins/RSClientMixin.java

@@ -591,6 +591,13 @@ public abstract class RSClientMixin implements RSClient
 		return varps[varpId];
 	}
 
+	@Inject
+	@Override
+	public int getVarpValue(int varpId)
+	{
+		return getVarpValue(getVarps(), varpId);
+	}
+
 	@Inject
 	@Override
 	public void setVarpValue(int[] varps, int varpId, int value)