Engine: BasePythonEnvironment boolean run

[Tom-Kingstone]

NOTE: Depends on

Issues addressed by this PR

Closes #130

added a boolean "run" to BasePythonEnvironment, and added PreviousVersion and Input attributes.

Test files

place a BasePythonEnvironment component on the canvas and input a bool into run. Test that setting Run to true returns the Python environment.

Changelog

Additional comments

[Tom-Kingstone]

@BHoMBot check core, compliance

[bhombot-ci[bot]]

@Tom-Kingstone sorry, I didn't understand. Was that comment an instruction for me? If so, could you state again what check you would like me to do? For a list of available instructions, please see [this wiki page](https://github.com/BHoM/documentation/wiki/Continuous-Integration).

[Tom-Kingstone]

@BHoMBot check core @BHoMBot check compliance

[bhombot-ci[bot]]

@Tom-Kingstone to confirm, the following actions are now queued: - check `core` - check `code-compliance` - check `documentation-compliance` - check `project-compliance` - check `branch-compliance` - check `dataset-compliance` - check `copyright-compliance`

[Tom-Kingstone]

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[Tom-Kingstone]

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[bhombot-ci[bot]]

@Tom-Kingstone to confirm, the following actions are now queued: - check `code-compliance` - check `documentation-compliance` - check `project-compliance` - check `branch-compliance` - check `dataset-compliance` - check `copyright-compliance` - check `versioning`

[Tom-Kingstone]

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[bhombot-ci[bot]]

@Tom-Kingstone to confirm, the following actions are now queued: - check `core`

[Tom-Kingstone]

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[bhombot-ci[bot]]

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[bhombot-ci[bot]]

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[bhombot-ci[bot]]

FAO: @FraserGreenroyd @FraserGreenroyd is seeking dispensation on this Pull Request to skip a required check. Please can you provide authorisation for the check to be skipped, or provide assistance as appropriate. The check they wish to have dispensation on is installer. If you are providing dispensation on this occasion, please reply with: > @BHoMBot this is a DevOps instruction. I am authorising dispensation to be granted on check ref. `19589955334`

[FraserGreenroyd]

@BHoMBot this is a DevOps instruction. I am authorising dispensation to be granted on check ref. 19589955334

[bhombot-ci[bot]]

@FraserGreenroyd I have now provided a passing check on reference `19589955334` as requested.

[FraserGreenroyd]

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