Usually should not be included in mixin recipes with mixin

This is useless and even harmful for images that include both live
and install2.

The actual certified branch is always the same, and at the moment
you need to use propagator in it.

Also partially fix #41946

This package must always be installed in chroot in one transaction with
basesystem so that the correct package is installed.

- regular.mk: add regular-xfce-install target
- regular.mk: add use/firmware to regular-builder
- regular.mk: set KFLAVOUR to un-def for regular-builder on x86_64, aarch64
- dev: fix links to repositories for ports Sisyphus in generated source lists
- vmguest: exclude xorg-dri-virtio for armh
- plymouth: require branding-@BRANDING@-graphics
- cleanup: add CLEANUP_LIVE_PACKAGES
- mixin.mk: add polkit-rule-admin-root to mixin/regular-desktop
- .gitignore: exclude .image.in/files/.empty
- initrd-propagator: not add empty layer
- build-vm: fix PATH to tar2fs with future mkimage
- lib/profile.mk, build-distro: save current commit
- vmguest: update stage1 modules list
- stage2: stage1 modules list update
- live.mk: add language submenu to grub-net-install
- mixin.mk: control libnss-role is disabled for regular-desktops
- kernel: exclude bcmwl kernel module, see ALT bug 41620
- kworkstation: add latest commits from zerg@
- kworkstation: add stage2 lists
- all distro: add use/stage2/ata

xorg-dri-virtio not available for p10 armh.

For better support hardware.

It is necessary for a standard set of groups to be created for a
new user, and not just one 'users' group. These groups are tied
to polkit rules.

Use full PATH, because otherwise extra modules with the same
endings are packed.
Instead of listing modules from the same directory, the path
to the directory is used.
The 10-stage2 list has been cleaned up, but still has a lot
of redundancy. Need added some basic lists for all targets.

- kwrk: exclude flatpak-repo-flathub from livecd because fake initializing of flatpak directory tree