Add contexts for cross platform

[kendonB]

Add contexts for cross platform

Description

Adds contexts for cross platform as per https://github.com/dictation-toolbox/dragonfly/issues/293

Related Issue

None.

Motivation and Context

Allows for platform contexts to be used in ContextAction.

How Has This Been Tested

In a ContextAction on another branch.

Types of changes

• [x] Docs change / refactoring / dependency upgrade
• [ ] Bug fix (non-breaking change which fixes an issue or bug)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Renamed existing command phrases (we discourage this without a strong rationale).

Checklist

• [x] I have read the CONTRIBUTING document.
• [x] My code follows the code style of this project.
• [x] I have checked that my code does not duplicate functionality elsewhere in Caster.
• [x] My code implements all the features I wish to merge in this pull request.
• [ ] My change requires a change to the documentation.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests pass.

Maintainer/Reviewer Checklist

• [ ] Basic functionality has been tested and works as claimed.
• [ ] New documentation is clear and complete.
• [ ] Code is clear and readable.

[LexiconCode]

Nice this was definitely needed for cross-platform support.

[kendonB]

@LexiconCode happy to merge this?