Geometry_Engine: numerical solution in IsCoplanar replaced with geometrical one

[pawelbaran]

Issues addressed by this PR

Closes #2423
Closes #3294

Test files

General test files for the methods changed in this PR uploaded to SharePoint
Test file for #2423 linked in the issue

Changelog

Additional comments

This is the last PR in the current push in Geometry_Engine 🙈

[pawelbaran]

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[bhombot-ci]

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[pawelbaran]

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[peterjamesnugent]

Tested using the two scripts provided and the duplicate point script.

My one comment would be to make sure the various Geometry_Engine test scripts this milestone get incorperated into unit tests (in a seperate PR) so they don't get forgotten about.

[pawelbaran]

Thanks @peterjamesnugent for the review. Updating the UTs is on my radar, to be done in sprint 6 based on #3277 👍

[FraserGreenroyd]

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[bhombot-ci]

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[FraserGreenroyd]

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