The build failure on openSUSE is real, but the "fix" switched
the internal library accidentally to SHARED, without installing it.
It shouldn't be a library at all, really (if STATIC won't do).

FIXES #2203

Let this run overnight so we can see the appstream-api-change locally.

See #2202

- Most CalamaresUtils things go to Calamares
- YAML support to Calamares::YAML and then remove redundant "yaml"
  from the function names.

The locale bits were spread over Calamares::Locale and CalamaresUtils::Locale.

- Try to build with KF6
- Bodge out the actual loading-of-konsole-part

- Don't use the ${kfname} package itself, use it as a prefix for
  specific components of that package (e.g. ${kfname}CoreAddons)
- Use TYPE to indicate required packages, rather than using
  REQUIRED in the find_package call, to more-helpfully collect
  missing requirements.

1- Need to be careful switching dependencies from REQUIRED to OPTIONAL
2- Don't do ECM REQUIRED all over the place
3- Workaround neon CI not having KCrash (which translated to KF5 not
   found, which translated to a missing REQUIRED dependency, see 1).

Split the install-dependencies off into a shell script instead of
being part of the workflow, so that it can be run manually or
by other means than the GH workflow.

x86_64-suse-linux/bin/ld: libusers_internal.a(mocs_compilation.cpp.o):
  relocation R_X86_64_32 against symbol `_ZN6Config16staticMetaObjectE'
  can not be used when making a shared object; recompile with -fPIC
x86_64-suse-linux/bin/ld: failed to set dynamic section sizes: bad value
collect2: error: ld returned 1 exit status

add keyboard layout switch selector

The find_package() in the plasmalnf module seems to mark KF5 as not-found,
because one component is not found right then -- after that, CMake-time
fails because KF5 is still-required and not-found.

[users] CheckPWQuality.cpp Qt6 correction