Add internal mass to ground zone simulations

[Erida-Bendo]

Add InternalMass to ground zone creation part that feeds into SimulationResult process to get surface temperatures to replicate more accurate ground conditions.

[Tom-Kingstone]

Please remove the .idea folder from this PR (this can be done by reverting the most recent commit).
Otherwise code-wise the changes look good. Will test these changes myself when I have a fresh install of pollination.

[Tom-Kingstone]

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[Tom-Kingstone]

Tested and can confirm that the changes do not break simulation models, though I can't comment on how valid the simulation results are. Await approving review from @tg359 before merge

[Tom-Kingstone]

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[Tom-Kingstone]

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[tg359]

Approved on the basis that the process hasn't broken and that inclusion of internal mass would only increase the accuracy of the simulation.

In the next testing sprint the unit tests downstream of this code will need to be updated (https://github.com/BHoM/LadybugTools_Toolkit/tree/develop/LadybugTools_Engine/Python/tests/test_external_comfort) to ensure that they too pass, as values will change from what the tests were written against, so those tests will likely fail until update are made.

[Tom-Kingstone]

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[jamesramsden-bh]

Tom and I have reviewed unit tests, and no tests appear to be affected by these changes (either directly or downstream). This means that all unit tests are still passing, but also that there is probably a gap in the unit tests! I will add an issue to provide an additional test.