Interface with more functions from ClipperLib

[plut]

(this is more a feature request than a true issue...)

Reading the documentation from ClipperLib, this library supports Minkowski sum and difference:

http://www.angusj.com/delphi/clipper/documentation/Docs/Units/ClipperLib/Functions/MinkowskiSum.htm

However these are not interfaced by Clipper.jl. I looked up a bit and neither are they present in libcclipper (this is not surprising). Since these two functions are quite useful, it would be nice to have them exported in Clipper.jl!

[plut]

So I have written some code that makes these two functions (Minkowski sum and difference) visible in the Clipper_jll.jl library. What is the procedure for submitting a PR on this topic? Should I send the PR directly to Yggdrasil (who will review it then)? How is it then propagated to Clipper_jll.jl (is there an auto-build?)

[sjkelly]

That sounds about right. A PR to Yggdrasil, once merged, will update the _jll. Please tag me in the Yggdrail PR so I can test locally before merge in Yggdrasil.