Allow Watch3D nodes to run in software mode

[sm6srw]

Purpose

This pull request does:

• allow Watch3D nodes to run in software mode.

I think this is a leftover since the days when we supported WIndows 7/8. As far as I know, at least a software render should always be available in Windows 10/11.

This change also allows all Dynamo tests to pass on an ECS instance with GPU. These instances behaves as a multi GPU machine and for some reason, the RenderCapability object reports nothing useful. But everything points to that Dynamo is in hardware mode and the RenderMode object indicates this.

I will also try to run all tests on an instance without GPU.

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

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