Remove Revit 2020 support

[michal-pekacki]

NOTE: Depends on

Issues addressed by this PR

Closes #1527

Removed Revit 2020 support and updated the code.

Test files

Changelog

Additional comments

[vietle-bh]

I failed to see any problem with it 👍

[michal-pekacki]

@BHoMBot check compliance

[bhombot-ci]

@michal-pekacki to confirm, the following actions are now queued:

• check code-compliance
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[pawelbaran]

@BHoMBot check required

[bhombot-ci]

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

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There are 17 requests in the queue ahead of you.

[bhombot-ci]

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

[bhombot-ci]

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

[bhombot-ci]

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

[bhombot-ci]

@michal-pekacki just to let you know, I have provided a check-installer result to this Pull Request as it was detected to be linked to other Pull Requests in a series. The comment which triggered this check came from @pawelbaran on BHoM_Installer

[bhombot-ci]

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

[michal-pekacki]

@BHoMBot check versioning

[bhombot-ci]

@michal-pekacki to confirm, the following actions are now queued:

• check versioning

[pawelbaran]

@BHoMBot check versioning

[bhombot-ci]

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

• check versioning

[michal-pekacki]

@BHoMBot check ready-to-merge

[bhombot-ci]

@michal-pekacki to confirm, the following actions are now queued:

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[vietle-bh]

Reapproving after versioning fix 👍

[michal-pekacki]

@BHoMBot check ready-to-merge

[bhombot-ci]

@michal-pekacki to confirm, the following actions are now queued:

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