Use DSCResource.Common, Pin Pester and Support ModuleBuilder 1.7.0

[PlagueHO]

Pull Request (PR) description

Updates module to use DSCResource.Common. This PR pins Pester to 4.10.1 and updates Build.yml to support ModuleBuilder 1.7.0.

This Pull Request (PR) fixes the following issues

• Fixes #78
• Fixes #79
• Fixes #80

Task list

• [x] 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).
• [ ] 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 Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [ ] New/changed code adheres to DSC Community Style Guidelines.

@johlju - would you mind reviewing this one when you have time?

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This change is