[QGIS-Developer] Improvement to the plugin manager's upgradeable plugins details

[Mathieu Pellerin]

Greetings,

While applying a couple of commits to QGIS' plugin manager, I would like to
fix a long-standing UX issue with it, namely that plugins that show a newer
version available do _not_ show the latest changelog but rather the
changelog of the currently installed plugin version.

It'd much nicer, and exciting for users, to show what's new _prior to_
hitting the [ update plugin ] button.

For that to happen, we'd need either: a/ add the changelog information in
the repository XML file fetched (i.e.
https://plugins.qgis.org/plugins/plugins.xml?qgis=3.6), or b/ add a method
to fetch changelog strings from the repository site (for e.g.,
https://plugins.qgis.org/plugins/changelog.xml?names=plugin1,plugin2,plugin3
).

Unless adding the short changelog to the repository XML adds too many MBs,
I'd vote for option A.

Thoughts?

Mathieu
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