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).

Comece comparando a documentação vinculada de about_Preference_Variables do PowerShell 6.x e 5.1 e, em seguida, localize o recurso PSUseCompatibleCommands no PSScriptAnalyzer. Considera-se concluído quando o uso de variáveis de preferência obsoletas for sinalizado com uma declaração de que ele é incompatível com o PowerShell 6.0 e versões posteriores em todas as plataformas.