Remove default plugins PicoParsePagesContent and PicoExcerpt

As previously announced (see [Upgrade to Pico 1.0 page](http://picocms.org/in-depth/upgrade/)) we'll remove the default plugins `PicoParsePagesContent` and `PicoExcerpt` with the next Pico milestone. Needless to say, that you can still install both plugins without any problem - we'll add them to Pico's official [Plugins collection](http://picocms.org/plugins/) by then. Please note that the disadvantages of these plugins are still critical and we strongly advise to not use them. Please refer to the [Upgrade to Pico 1.0 page](http://picocms.org/in-depth/upgrade/) for details.

plugins/01-PicoParsePagesContent.php

@@ -1,40 +0,0 @@
-<?php
-
-/**
- * Parses the contents of all pages
- *
- * This plugin exists for backward compatibility and is disabled by default.
- * It gets automatically enabled when {@link PicoDeprecated} is enabled. You
- * can avoid this by calling {@link PicoParsePagesContent::setEnabled()}.
- *
- * This plugin heavily impacts Pico's performance, you should avoid to enable
- * it whenever possible! If you must parse the contents of a page, do this
- * selectively and only for pages you really need to.
- *
- * @author  Daniel Rudolf
- * @link    http://picocms.org
- * @license http://opensource.org/licenses/MIT The MIT License
- * @version 1.0
- */
-class PicoParsePagesContent extends AbstractPicoPlugin
-{
-    /**
-     * This plugin is disabled by default
-     *
-     * @see AbstractPicoPlugin::$enabled
-     */
-    protected $enabled = false;
-
-    /**
-     * Parses the contents of all pages
-     *
-     * @see DummyPlugin::onSinglePageLoaded()
-     */
-    public function onSinglePageLoaded(array &$pageData)
-    {
-        if (!isset($pageData['content'])) {
-            $pageData['content'] = $this->prepareFileContent($pageData['raw_content'], $pageData['meta']);
-            $pageData['content'] = $this->parseFileContent($pageData['content']);
-        }
-    }
-}

plugins/02-PicoExcerpt.php

@@ -1,81 +0,0 @@
-<?php
-
-/**
- * Creates a excerpt for the contents of each page (as of Pico v0.9 and older)
- *
- * This plugin exists for backward compatibility and is disabled by default.
- * It gets automatically enabled when {@link PicoDeprecated} is enabled. You
- * can avoid this by calling {@link PicoExcerpt::setEnabled()}.
- *
- * This plugin doesn't do its job very well and depends on
- * {@link PicoParsePagesContent}, what heavily impacts Pico's performance. You
- * should either use the Description meta header field or write something own.
- * Best solution seems to be a filter for twig, see e.g.
- * {@link https://gist.github.com/james2doyle/6629712}.
- *
- * @author  Daniel Rudolf
- * @link    http://picocms.org
- * @license http://opensource.org/licenses/MIT The MIT License
- * @version 1.0
- */
-class PicoExcerpt extends AbstractPicoPlugin
-{
-    /**
-     * This plugin is disabled by default
-     *
-     * @see AbstractPicoPlugin::$enabled
-     */
-    protected $enabled = false;
-
-    /**
-     * This plugin depends on PicoParsePagesContent
-     *
-     * @see PicoParsePagesContent
-     * @see AbstractPicoPlugin::$dependsOn
-     */
-    protected $dependsOn = array('PicoParsePagesContent');
-
-    /**
-     * Adds the default excerpt length of 50 words to the config
-     *
-     * @see DummyPlugin::onConfigLoaded()
-     */
-    public function onConfigLoaded(array &$config)
-    {
-        if (!isset($config['excerpt_length'])) {
-            $config['excerpt_length'] = 50;
-        }
-    }
-
-    /**
-     * Creates a excerpt for the contents of each page
-     *
-     * @see PicoExcerpt::createExcerpt()
-     * @see DummyPlugin::onSinglePageLoaded()
-     */
-    public function onSinglePageLoaded(array &$pageData)
-    {
-        if (!isset($pageData['excerpt'])) {
-            $pageData['excerpt'] = $this->createExcerpt(
-                strip_tags($pageData['content']),
-                $this->getConfig('excerpt_length')
-            );
-        }
-    }
-
-    /**
-     * Helper function to create a excerpt of a string
-     *
-     * @param  string $string    the string to create a excerpt from
-     * @param  int    $wordLimit the maximum number of words the excerpt should be long
-     * @return string            excerpt of $string
-     */
-    protected function createExcerpt($string, $wordLimit)
-    {
-        $words = explode(' ', $string);
-        if (count($words) > $wordLimit) {
-            return trim(implode(' ', array_slice($words, 0, $wordLimit))) . '&hellip;';
-        }
-        return $string;
-    }
-}