Diffing_Engine: reworked the NumericTolerance mechanism

[alelom]

Issues addressed by this PR

Closes #3039

Reworked the NumericalTolerance mechanism to compute the difference between the numbers, then see if it is larger than the specified tolerance.

Test files

See #3039.

Additional comments

[pawelbaran]

Code changes make sense to me, but I am getting errors in tests:

[alelom]

Code changes make sense to me, but I am getting errors in tests

Thanks, I missed to update the older tests to the new mechanism. I'd post comments on the Tests in the DiffingTests_Prototypes PR, until I manage to port the tests from there to the .ci folder in the BHoM_Engine. See the DiffingTests PR: BHoM/DiffingTests_Prototypes#12

[pawelbaran]

@BHoMBot check required

[bhombot-ci]

@pawelbaran to confirm, the following actions are now queued:

• check code-compliance
• check documentation-compliance
• check project-compliance
• check core
• check null-handling
• check serialisation
• check versioning
• check installer

There are 20 requests in the queue ahead of you.

[alelom]

@BHoMBot check core

[bhombot-ci]

@alelom to confirm, the following actions are now queued:

• check core

[alelom]

@BHoMBot check required

[bhombot-ci]

@alelom to confirm, the following actions are now queued:

• check code-compliance
• check documentation-compliance
• check project-compliance
• check core
• check null-handling
• check serialisation
• check versioning
• check installer

[bhombot-ci]

The check core has already been run previously and recorded as a successful check. This check has not been run again at this time.

[pawelbaran]

All tests passed, also successfully tested on actual sample problems.

[pawelbaran]

@BHoMBot check ready-to-merge

[bhombot-ci]

@pawelbaran to confirm, the following actions are now queued:

• check ready-to-merge

There are 16 requests in the queue ahead of you.

[pawelbaran]

@BHoMBot check copyright-compliance
@BHoMBot check dataset-compliance
@BHoMBot check unit-tests

[bhombot-ci]

@pawelbaran to confirm, the following actions are now queued:

• check copyright-compliance
• check dataset-compliance
• check unit-tests