matrix-nio backend start, QGuiApplication class

- Started work on the matrix-nio backend, which will be used instead
  of matrix-python-sdk for greater control and cleaner design

- Have an Application (QGuiApplication) class to habdle argument parsing
  and setting some Qt properties like application name

harmonyqml/components/Window.qml

@@ -5,7 +5,6 @@ ApplicationWindow {
     visible: true
     width: 640
     height: 700
-    title: "Harmony QML"
 
     Loader {
         anchors.fill: parent