Add back legacy mod edit, add checksums for all legacy jars

gui/dialogs/ModEditDialogCommon.h

@@ -0,0 +1,9 @@
+#pragma once
+#include <QModelIndex>
+#include <QDesktopServices>
+#include <QWidget>
+#include <logic/Mod.h>
+
+bool lastfirst(QModelIndexList &list, int &first, int &last);
+
+void showWebsiteForMod(QWidget *parentDlg, Mod &m);