Format-Path add ExpandEnvironmentVariable Parameter

[dan-hughes]

Pull Request (PR) description

Add ExpandEnvironmentVariable to Format-Path.

This Pull Request (PR) fixes the following issues

• Fixes Format-Path: Support expand environment variables #147

Task list

• Added an entry to the change log under the Unreleased section of the
  file CHANGELOG.md. Entry should say what was changed and how that
  affects users (if applicable), and reference the issue being resolved
  (if applicable).
• Documentation added/updated in README.md.
• Comment-based help added/updated for all new/changed functions.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Community Testing Guidelines.
• Integration tests added/updated (where possible). See
  DSC Community Testing Guidelines.
• New/changed code adheres to DSC Community Style Guidelines.

---

This change is 

[dan-hughes]

@johlju,

The changelog seems to be out of sync. The last release has no entry.

Back to this PR, should the Environment Variables be expanded first before any other logic?

[johlju]

The changelog seems to be out of sync. The last release has no entry.

It's because we merged this PR and released it when the change was not in the unreleased section. I missed that. 🙂
https://github.com/dsccommunity/DscResource.Common/pull/151/files#diff-06572a96a58dc510037d5efa622f9bec8519bc1beab13c9f251e97e657a9d4ed

[johlju]

...should the Environment Variables be expanded first before any other logic?

I think it might be better it expand them first because that could expand to a drive letter etc. 🤔

[johlju]

Reviewed 1 of 3 files at r1, 1 of 1 files at r2, 1 of 1 files at r3, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @dan-hughes)