-extensions won't build unless the CMake modules are (somewhat) self-contained.

When running a command in the chroot, don't set TMP (and similar)
variables because those directories might nog make sense in the
target (yet).

FIXES #2269

libcalamares: add compat and packages headers to be installed;

Use case would be customization of default modules, eg packagechooser requires compat/Variant.h and packages/Globals.h to compile in the calamares-extension repo

Signed-off-by: artoo <artoo@artixlinux.org>

If set to *ON*, then the dependencies for these two are required
(e.g. QtXml and/or AppStreamQt).

Add an Ubuntu devel CI

- add a CMake helper for finding variations of AppStreamQt
- adapt packagechooser and packagechooserq
- adopt a slightly more modern CMake style here

Allowing aliases and not using a canonical name for
them (e.g. mapping "view" to "viewmodule") is annoying
since the target name depends on which alias is passed
in to the function. Drop one of the two aliases.

greetd: Add custom CSS file path to gtkgreet

- the prettyName() function returns names, labels. Use @title context.
- the prettyDescription() is for the summary page. Use @info context.
- the prettyStatus() is for status during installation. Use @status context.

While here, tighten up the wording some.

Improve context

One QObject-based class per source file helps lupdate
figure out what goes where, avoids warning about unknown
class / namespace ::Config.

Otherwise starting in one language will never change the
formatting of percentages when the language changes
later (example: Turkish writes %30, while Dutch writes 30%).

FIXES #2258

The list of translations from Transifex contains "en", and we
add it explicitly a second time -- instead of fixing those and
needing to ensure that the source language is returned, or optionally
adding "en" if it isn't in the list already, just de-duplicate.

FIXES #2257

Was picking up settings stored from a previous test,
leading to a spurious failure.

Add support for systemd-machine-id variations

Fix mount defaults

The comment and examples above the mountOptions already indicate
zstd:1 for compression. Empirically, this has proven out to be a
reasonable default choice and should be actually used in the default
configuration.