Move storage upload configuration to separate tab, later it can be uses for a plugin manager

src/config/shortcutswidget.cpp

@@ -1,3 +1,20 @@
+// Copyright(c) 2020 Yurii Puchkov at Namecheap & Contributors
+//
+// This file is part of Flameshot.
+//
+//     Flameshot is free software: you can redistribute it and/or modify
+//     it under the terms of the GNU General Public License as published by
+//     the Free Software Foundation, either version 3 of the License, or
+//     (at your option) any later version.
+//
+//     Flameshot is distributed in the hope that it will be useful,
+//     but WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//     GNU General Public License for more details.
+//
+//     You should have received a copy of the GNU General Public License
+//     along with Flameshot.  If not, see <http://www.gnu.org/licenses/>.
+
 #include "shortcutswidget.h"
 #include "setshortcutwidget.h"
 #include <QHeaderView>