KDE Gear "6.0" status update: all 40 games & 2 libs now Qt6-only in master

[Friedrich W. H. Kossebau]

Hi,

just a quick heads-up to keep more people in the loop:

all the 40 game apps & 2 game libs covered by KDE Gear starting today are now 
Qt6-only in their master branches. And thus can/will be released based on Qt6/
KF6 in the KDE Gear "6.0" 24.02 release.

So the section "Games" can be checked off WRT Qt6 porting for KDE Gear.

For libkdegames I plan to use the window of opportunity with API/ABI changes 
to consolidate some things, e.g.
* Rename Kg* classes to KGame*, to iron out some historic artifacts
  https://invent.kde.org/games/libkdegames/-/merge_requests/30
* Split-off QWidgets API into separate library,
  to prepare more QML work in the years to come

Cheers
Friedrich