Remove the dependence on RoomManager from NeochatConnection.

At the same time use the roomCreated signal from connection for auto resolving as it's specifically designed for user created rooms.

src/neochatconnection.h

@@ -14,6 +14,7 @@
 #include <Quotient/keyimport.h>
 #endif
 
+#include "enums/messagetype.h"
 #include "linkpreviewer.h"
 #include "models/threepidmodel.h"
 
@@ -198,6 +199,11 @@ Q_SIGNALS:
     void badgeNotificationCountChanged(NeoChatConnection *connection, int count);
     void canCheckMutualRoomsChanged();
 
+    /**
+     * @brief Request a message be shown to the user of the given type.
+     */
+    void showMessage(MessageType::Type messageType, const QString &message);
+
     /**
      * @brief Request a error message be shown to the user.
      */