Compute the cell area for an infinite polygon

[AaronGhost]

Add a new function cellarea to compute an InfinitePolygon area. The function deals with infinite cases, degenerate cases (reduced to a point, a segment) and the normal polygon case where the area is well defined with the shoelace method.

[dgleich]

This looks good! Thanks! Just waiting for tests to run.

[dgleich]

Looks like we are getting some test errors from Aqua/JET. I'll need to dig into those in a bit to see.

[dgleich]

The error is

Stale dependencies |    1      1  0.9s
Delaunator [466f8f70-d5e3-4806-ac0b-a54b75a91218] does not declare a compat entry for the following extras:
6-element Vector{Base.PkgId}:
 Aqua [4c88cf16-eb10-579e-8560-4a9242c79595]
 GeometryBasics [5c1252a2-5f33-56bf-86c9-59e7332b4326]
 JET [c3a54625-cd67-489e-a8e7-0a5a0ff4e31b]
 JSON [682c06a0-de6a-54ab-a142-c8b1cf79cde6]
 StableRNGs [860ef19b-820b-49d6-a774-d7a799459cd3]
 Test [8dfed614-e22c-5e08-85e1-65c5234f0b40]
Delaunator [466f8f70-d5e3-4806-ac0b-a54b75a91218] extras: Test Failed at /Users/dgleich/.julia/packages/Aqua/9p8ck/src/deps_compat.jl:60
  Expression: isempty(result)
   Evaluated: isempty(Base.PkgId[Aqua [4c88cf16-eb10-579e-8560-4a9242c79595], GeometryBasics [5c1252a2-5f33-56bf-86c9-59e7332b4326], JET [c3a54625-cd67-489e-a8e7-0a5a0ff4e31b], JSON [682c06a0-de6a-54ab-a142-c8b1cf79cde6], StableRNGs [860ef19b-820b-49d6-a774-d7a799459cd3], Test [8dfed614-e22c-5e08-85e1-65c5234f0b40]])
Stacktrace:

[dgleich]

Ah - I think this is because the extras are all used just for testing, so we should move them to the test repo?

[AaronGhost]

The tests with Aqua already don't passed on master. I opened a new PR #16 to fix the tests on master.