[Mapnik] new port

[mathisloge]

Describe the pull request
adds mapnik without forking the mapnik repository. However, this PR needs the current master.

Adds the mapbox-geometry and mapbox-polyline ports. (added in #16838).

• What does your PR fix?
  Fixes [New Port Request] <Mapnik> #7526
  Since i have screwed up the previous PR [Mapnik] new port #14628 i've done this one again.

• Which triplets are supported/not supported? Have you updated the CI baseline?
  needs CI test

• Does your PR follow the maintainer guide? yes

todo

• update REPO and REF to mapnik repo when upstream was merged
• wait for CMake build support mapnik/mapnik#4191 to be merged

[JonLiu1993]

@mathisloge ,If this pr is ready for review, please turn to open state

[mathisloge]

@mathisloge ,If this pr is ready for review, please turn to open state

Yes. Might take some time until upstream gets merged.

[mathisloge]

standalone mapnik demo which tests the most common functionalities

• plugin loading
• file reading
• map rendering with fonts

https://github.com/mathisloge/mapnik-vcpkg-test

[mathisloge]

updated to latest commit. It adds mapnik::core as a public dependency of mapnik::mapnik. Changed the usage a bit

[BillyONeal]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[BillyONeal]

Sorry for the CI failures, we backed out the check that caused everything to fail for the last 10 hours or so

[dg0yt]

@mathisloge For a more convenient CI trigger:

git commit --allow-empty -m "[skip actions] Trigger CI"
git push

[NancyLi1013]

LGTM now, thanks for your efforts. It's has taken so long time on this port. @mathisloge

[mathisloge]

@NancyLi1013 thanks for your reviews!
It was indeed a very long time but it has also contributed a lot to upstream (windows support and a far easier setup to build upstream itself)

[BillyONeal]

Thanks for the new port!