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/UI.qml

@@ -24,10 +24,10 @@ Controls1.SplitView {
         }
 
         id: "pageStack"
-        initialItem: Chat.Root {
-            user: Backend.accountsModel.get(0)
-            room: Backend.roomsModel[Backend.accountsModel.get(0).user_id].get(0)
-        }
+//        initialItem: Chat.Root {
+            //user: Backend.accountsModel.get(0)
+            //room: Backend.roomsModel[Backend.accountsModel.get(0).user_id].get(0)
+        //}
 
         onCurrentItemChanged: currentItem.forceActiveFocus()
 

harmonyqml/components/Window.qml

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