devel/google-styleguide: Fix and save from expiration

[jrm]

Summary

devel/google-styleguide: Fix and save from expiration

• switch to GitHub
• use date-based version numbers
• set licenses
• install xml descriptions of style guides
• install files for editor integration
• install optional documentation
• add pkg-plist

Test Plan

portlint -C: OK
testport: OK (poudriere: 11.0-RELEASE-p1, amd64, with and without DOCS)

[jrm]

Use date-based version numbers.

[mat]

The pkg-descr is getting a bit long.

devel/google-styleguide/Makefile

5 ↗

(On Diff #26662)

I'm not exactly sure about the version here, the commit you are referencing was on March 2nd, not the 25th.

[jrm]

• Set the version to the date of the last upstream commit.
• Update pkg-descr.

[jrm]

Update distinfo after version change.