Upgrade to or support building with Qt 6

[JamieWhite]

Is your feature request related to a problem? Please describe.

OBS currently supports Qt 5 and Qt 6 on their repo. They're aiming to get a beta Qt 6 build out in the next month and a final release in August. Plugins built against Qt 5 will not work with OBS Qt 6 so they'll either need to move to Qt 6 or support both. More details here https://github.com/obsproject/obs-studio/discussions/6481

Describe the solution you'd like

Support Qt 6

Describe alternatives you've considered

There are no alternatives if we want to maintain support with OBS going forward

Additional context

The main driver for moving to Qt 6 is to support Apples M1 chips natively. In Qt 5 OBS was running via rosetta which has a fairly significant performance impact.

[cpyarger]

Thank you for the notice, Ill add it to the list of things to update.