Remove PicoPluginInterface::__construct()

It doesn't really matter how the current Pico instance is injected into the plugin unless PicoPluginInterface::getPico() is implemented

lib/AbstractPicoPlugin.php

@@ -77,7 +77,9 @@ abstract class AbstractPicoPlugin implements PicoPluginInterface
     private $dependants;
 
     /**
-     * @see PicoPluginInterface::__construct()
+     * Constructs a new instance of a Pico plugin
+     *
+     * @param Pico $pico current instance of Pico
      */
     public function __construct(Pico $pico)
     {

lib/PicoPluginInterface.php

@@ -30,13 +30,6 @@
  */
 interface PicoPluginInterface
 {
-    /**
-     * Constructs a new instance of a Pico plugin
-     *
-     * @param Pico $pico current instance of Pico
-     */
-    public function __construct(Pico $pico);
-
     /**
      * Handles a event that was triggered by Pico
      *