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/TokenFactory.php

@@ -0,0 +1,118 @@
+<?php
+
+/**
+ * Factory for token generation.
+ *
+ * @note Doing some benchmarking indicates that the new operator is much
+ *       slower than the clone operator (even discounting the cost of the
+ *       constructor).  This class is for that optimization.
+ *       Other then that, there's not much point as we don't
+ *       maintain parallel HTMLPurifier_Token hierarchies (the main reason why
+ *       you'd want to use an abstract factory).
+ * @todo Port DirectLex to use this
+ */
+class HTMLPurifier_TokenFactory
+{
+    // p stands for prototype
+
+    /**
+     * @type HTMLPurifier_Token_Start
+     */
+    private $p_start;
+
+    /**
+     * @type HTMLPurifier_Token_End
+     */
+    private $p_end;
+
+    /**
+     * @type HTMLPurifier_Token_Empty
+     */
+    private $p_empty;
+
+    /**
+     * @type HTMLPurifier_Token_Text
+     */
+    private $p_text;
+
+    /**
+     * @type HTMLPurifier_Token_Comment
+     */
+    private $p_comment;
+
+    /**
+     * Generates blank prototypes for cloning.
+     */
+    public function __construct()
+    {
+        $this->p_start = new HTMLPurifier_Token_Start('', array());
+        $this->p_end = new HTMLPurifier_Token_End('');
+        $this->p_empty = new HTMLPurifier_Token_Empty('', array());
+        $this->p_text = new HTMLPurifier_Token_Text('');
+        $this->p_comment = new HTMLPurifier_Token_Comment('');
+    }
+
+    /**
+     * Creates a HTMLPurifier_Token_Start.
+     * @param string $name Tag name
+     * @param array $attr Associative array of attributes
+     * @return HTMLPurifier_Token_Start Generated HTMLPurifier_Token_Start
+     */
+    public function createStart($name, $attr = array())
+    {
+        $p = clone $this->p_start;
+        $p->__construct($name, $attr);
+        return $p;
+    }
+
+    /**
+     * Creates a HTMLPurifier_Token_End.
+     * @param string $name Tag name
+     * @return HTMLPurifier_Token_End Generated HTMLPurifier_Token_End
+     */
+    public function createEnd($name)
+    {
+        $p = clone $this->p_end;
+        $p->__construct($name);
+        return $p;
+    }
+
+    /**
+     * Creates a HTMLPurifier_Token_Empty.
+     * @param string $name Tag name
+     * @param array $attr Associative array of attributes
+     * @return HTMLPurifier_Token_Empty Generated HTMLPurifier_Token_Empty
+     */
+    public function createEmpty($name, $attr = array())
+    {
+        $p = clone $this->p_empty;
+        $p->__construct($name, $attr);
+        return $p;
+    }
+
+    /**
+     * Creates a HTMLPurifier_Token_Text.
+     * @param string $data Data of text token
+     * @return HTMLPurifier_Token_Text Generated HTMLPurifier_Token_Text
+     */
+    public function createText($data)
+    {
+        $p = clone $this->p_text;
+        $p->__construct($data);
+        return $p;
+    }
+
+    /**
+     * Creates a HTMLPurifier_Token_Comment.
+     * @param string $data Data of comment token
+     * @return HTMLPurifier_Token_Comment Generated HTMLPurifier_Token_Comment
+     */
+    public function createComment($data)
+    {
+        $p = clone $this->p_comment;
+        $p->__construct($data);
+        return $p;
+    }
+}
+
+// vim: et sw=4 sts=4