Use the forge mirrors for downloading forge libraries

Let's hope we never, ever see a forge download error again.

logic/net/ForgeMirror.h

@@ -0,0 +1,10 @@
+#pragma once
+#include <QString>
+
+struct ForgeMirror
+{
+	QString name;
+	QString logo_url;
+	QString website_url;
+	QString mirror_url;
+};