Move neofetch and btop to desktop+ximper tag. Add cascadia-code font, extension-manager, switcheroo-control to default packages.

- Sudo is enabled by default.
- Added some GNOME extentions.

etersoft/virt-machines etersoft/virt-manager etersoft/gnome-boxes etersoft/virtualbox etersoft/00_office etersoft/libreoffice-still etersoft/libreoffice-latest etersoft/01_games
and others

- alternatives: add x-terminal-emulator
- regular.mk, regular-vm.mk: set KFLAVOUR=un-def for BRANCH=p10 on
  x86_64, aarch64
- regular-server: drop php8.0 group
- e2k fixes from mike@
- alt-server: latest commits from jqt4@
- kworkstation: latest commits from zerg@

c10f1, c10f2...