[bug #56774] support Rust programming language

[Kévin]

Follow-up Comment #3, bug #56774 (project gettext):

I would like to work on that feature.

I looked around the code a bit and basically we need "format-rust.c" for
_msgfmt_ and "x-rust.c" for _xgettext_, right?

Here are Rust i18n libraries compatible with gettext:

* gettext <https://crates.io/crates/gettext>: emulates _gettext_. It provides
_gettext_, _ngettext_, _pgettext_ and _npgettext_ methods on a _Catalog_
object with the same API as the corresponding _gettext_ functions. It doesn't
support Rust string formatting.
* gettext-rs <https://crates.io/crates/gettext-rs>: uses _gettext_. It
provides _gettext_, _ngettext_, _pgettext_, _npgettext_, _dcgettext_,
_dcngettext_, _dgettext_, _dngettext_ methods with the same API as the
corresponding _gettext_ functions. It provides macros with the same names and
the macro invocation operator '!' that allow Rust string formatting while
keeping a regular function API. It doesn't support all of Rust string format
yet.
* tr <https://crates.io/crates/tr>: uses either of the two previous libraries.
It provides a single _tr!_ macro that allows Rust string formatting but has
its own API to support the same features as _gettext_, _ngettext_, _pgettext_,
_npgettext_. It doesn't support all of Rust string format yet. It provides its
own extractor called xtr <https://crates.io/crates/xtr>.

An extractor using keywords for _gettext_ functions names and macro names
should work with the two first libraries. A parser for Rust string format
should work with all three libraries.

GNOME Rust apps usually use the _gettext-rs_ library.

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