[GNU ELPA] Modus-Themes version 4.4.0

[ELPA update]

Version 4.4.0 of package Modus-Themes has just been released in GNU ELPA.
You can now find it in M-x list-packages RET.

Modus-Themes describes itself as:

  ===============================================
  Elegant, highly legible and customizable themes
  ===============================================

More at https://elpa.gnu.org/packages/modus-themes.html

## Summary:

  # Modus themes for GNU Emacs

  IMAGES HERE: <https://protesilaos.com/emacs/modus-themes-pictures>.

  Highly accessible themes, conforming with the highest standard for
  colour contrast between background and foreground values (WCAG AAA).
  They also are optimised for users with red-green colour deficiency.

  The themes are very customisable and provide support for a very wide
  range of packages.  Their manual is detailed so that new users can get
  started, while it also provides custom code for all sorts of more
  advanced customisations.

## Recent NEWS:

             ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
              CHANGE LOG OF THE MODUS THEMES FOR GNU EMACS
             ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━


This document contains the release notes that are included in each
tagged commit on the project's main git repository:
<https://github.com/protesilaos/modus-themes>.

The newest release is at the top.  Since the notes are meant to be in
plain text format, I copy them verbatim.

For further details, please consult these additional resources:

Manual
      <https://protesilaos.com/emacs/modus-themes>
Screenshots
      <https://protesilaos.com/emacs/modus-themes-pictures>


4.4.0
═════

  Before I cover the changes, a brief note about the canonical source of
  the `modus-themes' source code and corresponding documentation.

  The `modus-themes' are built into Emacs, as of version 28, but they
  are not developed in `emacs.git': I maintain my own Git repository
  (<https://github.com/protesilaos/modus-themes>) and sync with
  `emacs.git' whenever I publish a new version, such as this one. This
  means that my code is often ahead of the one in the Emacs tree
  (including the `master' branch). Similarly, the official manual, which
  is hosted on my website
  (<https://protesilaos.com/emacs/modus-themes>), covers topics not
  found in the corresponding `gnu.org' web pages.

  In the opening section of the manual I include references to the
  canonical sources, but I still get comments about GNU web pages that I
  do not control. Please check those links before reporting issues that
  I can do nothing about.


No more SourceHut
─────────────────

  Development continues on GitHub with GitLab as a mirror. I explained
  my reasons here:
  <https://protesilaos.com/codelog/2024-01-27-sourcehut-no-more/>.

  This is a change that affects all my Emacs packages.


Code blocks now have a background by default
────────────────────────────────────────────

  The user option `modus-themes-org-blocks' is obsolete. All code blocks
  now have a subtle grey background out-of-the-box. The block delimiter
  lines, such as the `#+begin_src' in Org mode, use the same background
  as the block's contents. This produces a style that (i) is easy to
  notice and (ii) employs minimal colouration. Furthermore, we no longer
  have any discrepancy between Org and similar modes like Markdown.

  Every theme has relevant semantic palette mappings to affect the
  underlying faces:

  • `bg-prose-block-delimiter'
  • `fg-prose-block-delimiter'
  • `bg-prose-block-contents'

  The old `prose-block' is now renamed to `fg-prose-block-delimiter'.
  Please update any such references in your configuration file.

  Users can customise those either for all themes via the user option
  `modus-themes-common-palette-overrides' or on a per-theme basis with
  something like `modus-operandi-palette-overrides'. The manual includes
  ready-to-use code samples that showcases the numerous permutations
  made possible by these new mappings:
  
<https://protesilaos.com/emacs/modus-themes#h:f44cc6e3-b0f1-4a5e-8a90-9e48fa557b50>.

  The old option to affect the user option `org-src-block-faces' as to
  have a different background for each specified programming language is
  no longer available. The previous design was inflexible, as I was
  hardcoding values for a few languages. Whereas it is better to empower
  the user with the choice of `language->colour' association. The manual
  shows how to do this:
  
<https://protesilaos.com/emacs/modus-themes#h:8c842804-43b7-4287-b4e9-8c07d04d1f89>.


More semantic mappings more inline code in prose-centric modes
──────────────────────────────────────────────────────────────

  For Org, Markdown, and related we have semantic palette mappings that
  target inline code constructs. For example, in Org we can have text
  inside of tilde signs to mark it up as code. In prior versions, the
  mappings were limited to just a foreground, but now they cover …  …