Common Tests - File Formatting: References missing cmdlets

[johlju]

Details of the problem, bug, or enhancement

The tests Common Tests - File Formatting (FileFormatting.common*) are referencing missing cmdlets.

• Get-UnicodeFilesList
• ConvertTo-UTF8 (used for schema.mof files)
• ConvertTo-ASCII (used for code script files)

They exist here: https://github.com/PowerShell/DscResource.Tests/blob/dev/MetaFixers.psm1

Verbose logs showing the problem (if applicable)

n/a

Suggested solution to the issue

Add the above cmdlets, and add a new cmdlet Set-SourceEncoding that scans for unicode files and correctly set the right encoding depending on file type.
Running just a cmdlet for the entire source folder would simplify by just running:

Get-UnicodeFilesList './source' | Set-SourceEncoding`