Status of Qt in SCons

I wanted to kick off a more public discussion of the qt status.

As an experiment, I've opened a "discussion" on github for this, on the 
theory that those are a little easier to find later (I know mailing list 
lives forever, but searching for specific topics leaves a little 
something to be desired).  I'm sure I'll hear back if people don't think 
this is a good approach.

https://github.com/SCons/scons/discussions/4018

cheers,

-- mats