Cleanup QML imports and license headers

- Group the imports into Qt, KDE, NeoChat
- Import the latest versions
- Remove unused imports
- Remove unused components
- Unify license header styling

imports/NeoChat/Component/ChatBox/ReplyPane.qml

@@ -1,12 +1,13 @@
-/* SPDX-FileCopyrightText: 2020 Carl Schwan <carl@carlschwan.de>
- * SPDX-FileCopyrightText: 2020 Noah Davis <noahadvs@gmail.com>
- * SPDX-License-Identifier: GPL-2.0-or-later
- */
+// SPDX-FileCopyrightText: 2020 Carl Schwan <carl@carlschwan.de>
+// SPDX-FileCopyrightText: 2020 Noah Davis <noahadvs@gmail.com>
+// SPDX-License-Identifier: GPL-2.0-or-later
 
 import QtQuick 2.15
 import QtQuick.Layouts 1.15
 import QtQuick.Controls 2.15
+
 import org.kde.kirigami 2.14 as Kirigami
+
 import org.kde.neochat 1.0
 
 Loader {