Devtools Improvements

- Now has tabs setup as more features are added
- First extra tab has basic server info
- Use mobileform to make it look nicer
- For the room data tab allow the room to be changed from within devtools
- For the room data tab allow m.room.member events to be filtered out so other event types can be found easily
- For the room data tab allow viewing room account data

network/neochat#557

src/neochatroom.cpp

@@ -1908,3 +1908,8 @@ void NeoChatRoom::sendLocation(float lat, float lon, const QString &description)
     };
     postJson("m.room.message", content);
 }
+
+QByteArray NeoChatRoom::roomAcountDataJson(const QString &eventType)
+{
+    return QJsonDocument(accountData(eventType)->fullJson()).toJson();
+}