BHoM_Engine: IToText fixed for primitives and DateTime

[pawelbaran]

Issues addressed by this PR

Closes #3019

Test files

On SharePoint

Changelog

Additional comments

[pawelbaran]

@BHoMBot check core
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[bhombot-ci]

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[adecler]

The code change makes sense and works well in GH:

[pawelbaran]

@BHoMBot check unit-tests

[bhombot-ci]

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

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[adecler]

Actually, I forgot to test one type and that's the one not working anymore:

[pawelbaran]

@BHoMBot check core
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@BHoMBot check unit-tests

[bhombot-ci]

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

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[adecler]

All good now:

[pawelbaran]

@BHoMBot check null-handling
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[bhombot-ci]

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[pawelbaran]

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[adecler]

@BHoMBot check ready-to-merge

[FraserGreenroyd]

@BHoMBot check ready-to-merge

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