Move dialogs into a separate dir and create them dynamically.

Add "ignore user".
Update libqmatrixclient.

imports/Spectral/Dialog/InviteUserDialog.qml

@@ -0,0 +1,28 @@
+import QtQuick 2.12
+import QtQuick.Controls 2.12
+import QtQuick.Layouts 1.12
+
+import Spectral.Component 2.0
+
+Dialog {
+    property var room
+
+    anchors.centerIn: parent
+    width: 360
+
+    id: root
+
+    title: "Invite User"
+
+    modal: true
+    standardButtons: Dialog.Ok | Dialog.Cancel
+
+    contentItem: AutoTextField {
+        id: inviteUserDialogTextField
+        placeholderText: "User ID"
+    }
+
+    onAccepted: room.inviteToRoom(inviteUserDialogTextField.text)
+
+    onClosed: destroy()
+}