media-sound/ardour: Desktop-related improvements

[puleglot]

* Install additional freedesktop files.
* Fix blurry application icon by installing (symlinking) icons for all
  provided sizes.
* Install slightly modified upstream .desktop file instead of generating
  our own.
* Use xdg.eclass to update desktop/icon/mimeinfo cache/databases.
* Convert waf configure options into an array.

[gentoo-bot]

Pull Request assignment

Submitter: @puleglot
Areas affected: ebuilds
Packages affected: media-sound/ardour

media-sound/ardour: @gentoo/proaudio

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[gentoo-repo-qa-bot]

Pull request CI report

Report generated at: 2020-10-25 00:56 UTC
Newest commit scanned: 95e3ff0
Status: ✅ good

There are existing issues already. Please look into the report to make sure none of them affect the packages in question:
https://qa-reports.gentoo.org/output/gentoo-ci/0a6d352fac/output.html

[fordfrog]

@puleglot thank you for the improvements and sorry for the delay...

i did two updates after your patch, see dc754d3

[puleglot]

Thank you too! :)