Improve performance of Package identification

Using -ListAvailable with Get-Command to ensure no module loading is
    attampeted while querying loaded commands.
    This improved performance when certain modules have not been
    loaded yet

base/src/Packagesz.class.inc.ps1

@@ -23,7 +23,7 @@ class Packagesz { #: System.Management.Automation.IValidateSetValuesGenerator {
         $local:valid = $Package.Condition[0].Logic -notin ([szLogic]::or, [szLogic]::ornot)
         $local:currentSys = [SystemName]::_GetValidValues('',$true,$true);
         $local:hostname = $(hostname)
-        $local:allCmdlets = Get-Command | Select-Object -ExpandProperty Name
+        $local:allCmdlets = Get-Command -ListImported | Select-Object -ExpandProperty Name
         
         $local:username = $( if( $env:USER ) { $env:USER } else { $env:USERNAME } )
         
@@ -45,7 +45,7 @@ class Packagesz { #: System.Management.Automation.IValidateSetValuesGenerator {
             }
             if( $v -and $c.AppExeExists ) {
                 $v = $v -and -not $($c.AppExeExists | Where-Object {
-                        -not ( Get-Command $_ -Type Application -ErrorAction SilentlyContinue )
+                        -not ( Get-Command -ListImported $_ -Type Application -ErrorAction SilentlyContinue )
                     })
             }
             if( $v -and $c.custom ) {