[Development] Stepping down as widgets maintainers

[Marc Mutz]

Hi all,

KDAB is handing back widgets maintenance, which means that I'm stepping 
down as widgets maintainer. The focus of KDAB contributions to Qt is 
clearly elsewhere these days (Qt3D, Core, tooling), and the module 
deserves more focus than it has seen lately.

To this end, Lars has assembled a team(!) of proposed widgets 
(sub)maintainers that we as KDAB and I personally fully support as 
successors.

In Lars' absence, I'll leave it to Frederik to introduce them to you in 
detail (as if introduction was needed...).

Thanks,
Marc