Pipe improvements, misc cleanup

* Pipe improvements; better filter code, pipeline etc.
* Moved commands in PDO plugin to dedicated namespace

plugins/com.noccy.pdo.shell/Shell/PdoShell.php

@@ -30,6 +30,7 @@ class PdoShell {
     private ?array $lastQuery = null;
 
     #[EnumSetting('output', [ 'table', 'vertical', 'dump' ])]
+    #[EnumSetting('table.style', [ 'box', 'compact', 'borderless' ])]
     private array $defaultOptions = [
         'output' => 'table',
         'table.maxwidth' => 40,