Move dialogs into a separate dir and create them dynamically.

Add "ignore user".
Update libqmatrixclient.

imports/Spectral/Dialog/MessageSourceDialog.qml

@@ -0,0 +1,27 @@
+import QtQuick 2.12
+import QtQuick.Controls 2.12
+
+Popup {
+    property string sourceText
+
+    anchors.centerIn: parent
+    width: 480
+
+    id: root
+
+    modal: true
+    padding: 16
+
+    closePolicy: Dialog.CloseOnEscape | Dialog.CloseOnPressOutside
+
+    contentItem: ScrollView {
+        clip: true
+
+        Label {
+            text: sourceText
+        }
+    }
+
+    onClosed: root.destroy()
+}
+