Add numerous `\DeclareFontSeriesChangeRule` entries

[user227621]

LaTeX is currently missing some \DeclareFontSeriesChangeRule entries. Consider the following example:

\documentclass{article}

\begin{document}

\fontfamily{NotoSans-TLF}\selectfont

\fontseries{lsc}\selectfont This is light semicondensed.

\fontseries{b}\selectfont This should be bold semicondensed. %but you get bold regular

\end{document}

Furthermore, it is documented that not all widths are yet supported:

%    Also: while I did set up all nine standard weight values from
%    \texttt{ul} to \texttt{ub} I only bothered to provide entries for
%    \texttt{ec},  \texttt{sc}, \texttt{c} and \texttt{x}, because other levels of
%    compression/expansion are not in any real fonts that I know.
%
%    Could and perhaps should be eventually extended to cover the
%    whole set.

This PR adds rules so that the full range of weights (from ul to ub) and widths (from uc to ux) is covered. The entries are sorted first by weight (from ul to ub) and then by width (from uc to ux). (Perhaps this gives a little structure to the long list of entries.)

Internal housekeeping

Status of pull request

• Ready to merge
• rollback needed?
• test files needed?

Checklist of required changes before merge will be approved

• [ ] Test file(s) added
• [x] Version and date string updated in changed source files
• [x] Relevant \changes entries in source included
• [x] Relevant changes.txt updated
• [ ] Rollback provided (if necessary)?
• [x] ltnewsX.tex (and/or latexchanges.tex) updated

[FrankMittelbach]

I'm going to look at this once you say it is ready, but not before returning from Prague, ie not before August. Fixing the conflict is probably not sensible right now as it will conflict again during the next weeks.

[FrankMittelbach]

And it should get a (draft) entry in ltnews40, at least a placeholder so that it is not forgotten, thanks.

[user227621]

@FrankMittelbach I've added an entry in ltnews40. Minor open questions in the comments above, otherwise this PR is ready for review.