Pin Pester, Convert to DSCResource.Common - Fixes #102, #103 and #105

[PlagueHO]

Pull Request (PR) description

• Updated to use the common module DscResource.Common - Fixes Issue #102.
• Fixed build failures caused by changes in ModuleBuilder module v1.7.0 by changing CopyDirectories to CopyPaths - Fixes Issue #103.
• Pin Pester module to 4.10.1 because Pester 5.0 is missing code coverage - Fixes Issue #105.

This Pull Request (PR) fixes the following issues

• Fixes #102
• Fixes #103
• Fixes #105

Task list

• [x] Added an entry under the Unreleased section of the change log in the CHANGELOG.md. Entry should say what was changed, and how that affects users (if applicable).
• [ ] Resource documentation added/updated in README.md in the resource folder.
• [ ] Resource parameter descriptions added/updated in 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.
• [x] Unit tests added/updated. See DSC Resource Testing Guidelines.
• [x] Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• [x] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

@johlju - would you mind reviewing when you have a chance?

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This change is 

[PlagueHO]

Hi @johlju - would you mind reviewing when you have time?