Porting qt6

[kiozen]

What is the linked issue for this pull request:

n/a

What you have done:

This is just a porting branch to aggregate patches

Steps to perform a simple smoke test:

Testing while using

Does the code comply to the coding rules and naming conventions Coding Guidelines:

• [x] yes

Is every user facing string in a tr() macro?

• [x] yes

Did you add the ticket number and title into the changelog? Keep the numeric order in each release block.

• [ ] yes, I didn't forget to change changelog.txt