Implemented certificate link handling

Move content of qml directory to parent directory src
Message notification take care of plurar/singular
Fix compilation of service for non-android linux
AddTrustedNode.qml show node details for confirmation before adding
Added TrustedNodeDetails.qml to show nodes details
TrustedNodesView.qml show node details on click
Qml app added minimal infrastructure to delegate link handling
Removed unused icons

retroshare-qml-app/src/BusyOverlay.qml

@@ -0,0 +1,44 @@
+/*
+ * 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/>.
+ */
+
+import QtQuick 2.0
+import QtQuick.Controls 2.0
+
+Rectangle
+{
+	id: busyOverlay
+
+	property string message
+
+	enabled: false
+	anchors.fill: parent
+
+	BusyIndicator
+	{
+		running: true
+		anchors.centerIn: parent
+	}
+
+	Button
+	{
+		text: busyOverlay.message
+		anchors.horizontalCenter: parent.horizontalCenter
+		anchors.bottom: parent.bottom
+	}
+}
+