Add Z option to allow setting a 3rd (Z) coordinate. Either 0 or an interpolation from grdtrack. #2405

Job	Run time
Julia 1 - ubuntu-latest - x64 - pull_request	19m 19s
Julia 1 - macos-latest - x64 - pull_request	33m 24s
Julia 1 - windows-latest - x64 - pull_request	22m 0s
Julia ~1.11.0-0 - ubuntu-latest - x64 - pull_request	18m 36s
Julia ~1.11.0-0 - macos-latest - x64 - pull_request	21m 44s
Julia ~1.11.0-0 - windows-latest - x64 - pull_request	22m 29s
	2h 17m 32s

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