made libssh::ssh_connect a non-blocking feature

- extended error handling when connecting via ssh

client/ui/qml/main2.qml

@@ -16,6 +16,9 @@ Window  {
     minimumWidth: GC.isDesktop() ? 360 : 0
     minimumHeight: GC.isDesktop() ? 640 : 0
 
+    color: "#0E0E11"
+
+    // todo
     onClosing: function() {
         console.debug("QML onClosing signal")
         UiLogic.onCloseWindow()
@@ -23,11 +26,6 @@ Window  {
 
     title: "AmneziaVPN"
 
-    Rectangle {
-        anchors.fill: parent
-        color: "#0E0E11"
-    }
-
     StackViewType {
         id: rootStackView