Use ImageItem in MessageDelegate.

src/matriqueroom.h

@@ -10,6 +10,7 @@ using namespace QMatrixClient;
 
 class MatriqueRoom : public Room {
   Q_OBJECT
+  Q_PROPERTY(QImage avatar READ getAvatar NOTIFY avatarChanged)
   Q_PROPERTY(bool hasUsersTyping READ hasUsersTyping NOTIFY typingChanged)
   Q_PROPERTY(QString usersTyping READ getUsersTyping NOTIFY typingChanged)
   Q_PROPERTY(QString cachedInput READ cachedInput WRITE setCachedInput NOTIFY
@@ -18,6 +19,8 @@ class MatriqueRoom : public Room {
   explicit MatriqueRoom(Connection* connection, QString roomId,
                         JoinState joinState = {});
 
+  QImage getAvatar() { return avatar(64); }
+
   const QString& cachedInput() const { return m_cachedInput; }
   void setCachedInput(const QString& input) {
     if (input != m_cachedInput) {