fixes #423

[regedit32]

Pull Request (PR) description

To work around the PSScriptAnalyzer introduced in 1.18 and described in #423 , this PR changes the order of the classes defined in schema.mof, for resources that had subclasses. The OMI_BaseResource class gets listed first now, which also happens to workaround the PSSA test that was erroneously failing.

This Pull Request (PR) fixes the following issues

#423

Task list

• Added an entry under the Unreleased section of the change log in the README.md.
  Entry should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in README.md.
• Resource parameter descriptions added/updated in README.md, schema.mof
  and comment-based help.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Resource Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[codecov-io]

Codecov Report

Merging #424 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #424   +/-   ##
=======================================
  Coverage   90.77%   90.77%           
=======================================
  Files          17       17           
  Lines        2438     2438           
=======================================
  Hits         2213     2213           
  Misses        225      225

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