zls is now Get-ZfsItem with zls as an Alias

Modified code to use more 'PowerShell' centric methods, easier on the
formatting as table.

zfs/Aliases/zls.ps1

@@ -0,0 +1 @@
+Get-ZfsItem

zfs/Get-ZfsItem.ps1

@@ -0,0 +1,25 @@
+[CmdletBinding()]param(
+    [string[]]$Options='name,used,avail,refer,canmount,mounted,mountpoint'
+)
+
+$Options = $Options -join ','
+if( $options -split ',' -notcontains 'name' ) { $options = "name,$Options" }
+$local:prev = '';
+zfs list -o $Options |
+    ForEach-Object { $_ -replace ' +',"`t" } |
+    ConvertFrom-Csv -Delimiter "`t" |
+    Where-Object Name -NotMatch '^rpool/var/lib/docker/' |
+    ForEach-Object {
+        $local:o = $_ | Select-Object @{L='-';E={''}},*
+        $local:tmpPrev = $o.Name -replace '^(\w+(\W\w+(\W\w+)?)?).*','$1';
+        if( $tmpPrev -notmatch "^$prev" -and $prev -notin ('','NAME') ) {
+            $o.'-' = "`n-"
+        };
+        $prev = $tmpPrev;
+        if( $o.MOUNTPOINT ) {
+            $o.MOUNTPOINT = $o.MOUNTPOINT -replace '^none$','<none>'
+        }
+        $o
+    } |
+    Format-Table -Wrap
+

zfs/zls.ps1

@@ -1,11 +0,0 @@
-$local:prev = "";
-zfs list -o name,used,avail,refer,canmount,mounted,mountpoint $args |
-    grep -v 'docker/' |
-    ForEach-Object {
-        $local:tmpPrev = $_ -replace '^(\w+(\W\w+(\W\w+)?)?).*','$1';
-        if( $tmpPrev -notmatch "^$prev" -and $prev -notin ('','NAME') ) {
-            '-----------------'
-        };
-        $prev = $tmpPrev;
-        $_
-    }