Diffing_Engine: Do not include static properties and fields in differences

[IsakNaslundBh]

Issues addressed by this PR

Closes #3406

Rule out static properties from inclusion in comparison. (see issue for a bit more detail).
Minor cleanup of unused using's.

This reinstates the behaviour for testing prior to this:
BHoM/Test_Toolkit#474

Test files

Check unit-tests. This should give a not insignificant improvement in speed for running through them, especially for tests containing System.Drawing.Color.

Also, @alelom , great if you can test this through your diffing tests.

Changelog

Additional comments

Example run before this PR:

https://github.com/BHoM/BHoM_Engine/runs/29579805351

[IsakNaslundBh]

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[alelom]

This works well. When profiling with >1000 elements having static properties (e.g. with 1000 Planes), this gives an improvement of about 50% less time.

Before and after comparison (from the DiffingTests_Prototypes):

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