PR Summary

Resolves #805.

Adds three new rules:

• UseCompatibleCommands: checks the compatibility of cmdlets and functions available by default with different PowerShell versions/platforms (effectively outmodes UseCompatibleCmdlets)
• UseCompatibleTypes: checks the compatibility of types/.NET APIs available by default with different PowerShell versions/platforms
• UseCompatibleSyntax: a simpler, by-hand rule that checks for known bad syntaxes (like [type]::new() and using module MyModule) when given PowerShell versions are targeted

The first two rules rely on profiles collected from PowerShell environments. The tools to collect this are included with the PR.

Done since opening PR

• Fix typename serialisation in JSON
• Add type compatibility check rule
• Add more testing
• Document code properly
• Collect profiles on more platforms

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.