Update libqmatrixclient.

Enable member lazy loading.
Some Qt 5.12 fix.

src/controller.cpp

@@ -42,7 +42,12 @@ Controller::Controller(QObject* parent)
   QTimer::singleShot(0, this, SLOT(invokeLogin()));
 }
 
-Controller::~Controller() {}
+Controller::~Controller() {
+  for (Connection* c : m_connections) {
+    c->stopSync();
+    c->saveState();
+  }
+}
 
 inline QString accessTokenFileName(const AccountSettings& account) {
   QString fileName = account.userId();
@@ -107,6 +112,8 @@ void Controller::addConnection(Connection* c) {
 
   m_connections.push_back(c);
 
+  c->setLazyLoading(true);
+
   connect(c, &Connection::syncDone, this, [=] {
     emit syncDone();
     c->sync(30000);