Replace existing autoloader with Composer-supplied

- Move Friendica namespace to `src`
- Move required `ezyang/htmlpurifier` to vendor
- Remove existing static autoloader
- Change boot.php reference to the autoloader

vendor/ezyang/htmlpurifier/library/HTMLPurifier/HTMLModule/Text.php

@@ -0,0 +1,87 @@
+<?php
+
+/**
+ * XHTML 1.1 Text Module, defines basic text containers. Core Module.
+ * @note In the normative XML Schema specification, this module
+ *       is further abstracted into the following modules:
+ *          - Block Phrasal (address, blockquote, pre, h1, h2, h3, h4, h5, h6)
+ *          - Block Structural (div, p)
+ *          - Inline Phrasal (abbr, acronym, cite, code, dfn, em, kbd, q, samp, strong, var)
+ *          - Inline Structural (br, span)
+ *       This module, functionally, does not distinguish between these
+ *       sub-modules, but the code is internally structured to reflect
+ *       these distinctions.
+ */
+class HTMLPurifier_HTMLModule_Text extends HTMLPurifier_HTMLModule
+{
+    /**
+     * @type string
+     */
+    public $name = 'Text';
+
+    /**
+     * @type array
+     */
+    public $content_sets = array(
+        'Flow' => 'Heading | Block | Inline'
+    );
+
+    /**
+     * @param HTMLPurifier_Config $config
+     */
+    public function setup($config)
+    {
+        // Inline Phrasal -------------------------------------------------
+        $this->addElement('abbr', 'Inline', 'Inline', 'Common');
+        $this->addElement('acronym', 'Inline', 'Inline', 'Common');
+        $this->addElement('cite', 'Inline', 'Inline', 'Common');
+        $this->addElement('dfn', 'Inline', 'Inline', 'Common');
+        $this->addElement('kbd', 'Inline', 'Inline', 'Common');
+        $this->addElement('q', 'Inline', 'Inline', 'Common', array('cite' => 'URI'));
+        $this->addElement('samp', 'Inline', 'Inline', 'Common');
+        $this->addElement('var', 'Inline', 'Inline', 'Common');
+
+        $em = $this->addElement('em', 'Inline', 'Inline', 'Common');
+        $em->formatting = true;
+
+        $strong = $this->addElement('strong', 'Inline', 'Inline', 'Common');
+        $strong->formatting = true;
+
+        $code = $this->addElement('code', 'Inline', 'Inline', 'Common');
+        $code->formatting = true;
+
+        // Inline Structural ----------------------------------------------
+        $this->addElement('span', 'Inline', 'Inline', 'Common');
+        $this->addElement('br', 'Inline', 'Empty', 'Core');
+
+        // Block Phrasal --------------------------------------------------
+        $this->addElement('address', 'Block', 'Inline', 'Common');
+        $this->addElement('blockquote', 'Block', 'Optional: Heading | Block | List', 'Common', array('cite' => 'URI'));
+        $pre = $this->addElement('pre', 'Block', 'Inline', 'Common');
+        $pre->excludes = $this->makeLookup(
+            'img',
+            'big',
+            'small',
+            'object',
+            'applet',
+            'font',
+            'basefont'
+        );
+        $this->addElement('h1', 'Heading', 'Inline', 'Common');
+        $this->addElement('h2', 'Heading', 'Inline', 'Common');
+        $this->addElement('h3', 'Heading', 'Inline', 'Common');
+        $this->addElement('h4', 'Heading', 'Inline', 'Common');
+        $this->addElement('h5', 'Heading', 'Inline', 'Common');
+        $this->addElement('h6', 'Heading', 'Inline', 'Common');
+
+        // Block Structural -----------------------------------------------
+        $p = $this->addElement('p', 'Block', 'Inline', 'Common');
+        $p->autoclose = array_flip(
+            array("address", "blockquote", "center", "dir", "div", "dl", "fieldset", "ol", "p", "ul")
+        );
+
+        $this->addElement('div', 'Block', 'Flow', 'Common');
+    }
+}
+
+// vim: et sw=4 sts=4