Qml App: better Android interaction on URL export

Clipboard usage is uncommon in Android so export the URL via Intent too
that is the common pattern on Android

retroshare-qml-app/src/androidplatforminteracions.h

@@ -0,0 +1,34 @@
+#pragma once
+/*
+ * RetroShare Android QML App
+ * Copyright (C) 2017  Gioacchino Mazzurco <gio@eigenlab.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <QObject>
+#include <QUrl>
+
+#include "platforminteracions.h"
+
+class AndroidPlatformInteracions : public PlatformInteracions
+{
+	Q_OBJECT
+
+public:
+	explicit AndroidPlatformInteracions(QObject *parent = nullptr);
+
+public slots:
+	virtual void shareUrl(QUrl url);
+};