Fix PSScriptAnalyzer warnings and errors #3791

PS> $e = Get-ChildItem -Recurse -Include *.ps1,*.psm1 | ? { $_.fullname -notmatch "\\bin\\" } | % { Invoke-ScriptAnalyzer -Path $_ }
PS> $e | Group-Object severity

Count Name                      Group
----- ----                      -----
 1528 Warning                   {Microsoft.Windows.PowerShell.ScriptAnalyzer.Generic.DiagnosticRecord, Microsoft.Win...
   20 Error                     {Microsoft.Windows.PowerShell.ScriptAnalyzer.Generic.DiagnosticRecord, Microsoft.Win...
  129 Information               {Microsoft.Windows.PowerShell.ScriptAnalyzer.Generic.DiagnosticRecord, Microsoft.Win...