plugins: prevent plugins from overriding equals and hashCode

This has no legitimate use and several parts of the core assume that they are not overridden

runelite-client/src/main/java/net/runelite/client/plugins/Plugin.java

@@ -32,6 +32,18 @@ public abstract class Plugin implements Module
 {
 	protected Injector injector;
 
+	@Override
+	public final int hashCode()
+	{
+		return super.hashCode();
+	}
+
+	@Override
+	public final boolean equals(Object obj)
+	{
+		return super.equals(obj);
+	}
+
 	@Override
 	public void configure(Binder binder)
 	{