Qt6 investigation
Regarding Qt6:
- We need web sockets. For the msc streamer. That Qt6WebSockets library is currently planned for Qt6.2
- For Grantlee we might want to wait for it to support Qt6 (so Grantlee6 is available)
I fixed some other issues. But for the month to come, it doesn't make sense we will spend time on Qt6 support. Especially as QtCreator is still based on Qt5.