Check automatic variable availability

In comparing the Preference Variables documentation for PowerShell 6.x and newer:
https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_preference_variables?view=powershell-6

to the Preference Variables documentation for PowerShell 5.1:
https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_preference_variables?view=powershell-5.1

it seems that a number of Preference Variables were removed/deprecated from PowerShell. I just ran into this problem unexpectedly on a script when testing it on PowerShell 6.x.

To help with this problem, I would like the PSUseCompatibleCommands feature of PSScriptAnalyzer to flag the usage of deprecated Preference Variables and state that they are not compatible with PowerShell 6.0 and newer (on any platform including Windows).

まず、PowerShell 6.x および 5.1 の about_Preference_Variables に関するリンク先のドキュメントを比較し、次に PSScriptAnalyzer で PSUseCompatibleCommands 機能を見つけます。完了条件は、非推奨の preference variable の使用が、すべてのプラットフォームで PowerShell 6.0 以降と互換性がないことを示すステートメントとともに警告されることです。