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

- fix vmguest feature for non-x86 architectures (thx Alexey Sheplyakov
  @asheplyakov)

$ make regular-xfce.iso
[skipped the noise]
17:30:40 preparing distro config: build/distcfg.mk
make[1]: *** No rule to make target 'use/vmguest/vbox/dri', needed by 'use/vmguest/dri'.  Stop.
make: *** [Makefile:60: regular-xfce.iso] Error 1

Define dummy use/vmguest/vbox/dri use/vmguest/vmware/dri targets
for non-x86 architecures to avoid the problem.

- vmguest: unbreak on non-x86 architectures
- LoongArch:
  + install drivers and tools for VM guests
  + install dmidecode
  + do not build documentation (requires java and co)

The package is noarch, hence %ifarch is not going to work.
Check for %_build_cpu instead.