bug#27250: [PATCH] gnu: crawl: Update to 0.20.0.

[nee]

Hello, this updates crawl to 0.20.0 which came out about a week ago.
crawl-tiles indirectly updated through inheritance.

I also wrote a patch to make crawl upgrade cached strings in the SAVEDIR
by release version in addition to mtime. Without this patch crawl will
not detect that there is a new version installed and will not upgrade
files in ~/.crawl/saves/db/, because guix sets all the timestamps on the
installed files to 1970.

I will attempt to get this patch into crawl master.

Announcement for this release:
https://crawl.develz.org/wordpress/crawl-0-20-scarf-our-wanderful-fried-frogs
Changelog for this release:
https://github.com/crawl/crawl/blob/stone_soup-0.20/crawl-ref/docs/changelog.txt

0001-gnu-crawl-Update-to-0.20.0.patch
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