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/ConfigSchema/Builder/Xml.php

@@ -0,0 +1,144 @@
+<?php
+
+/**
+ * Converts HTMLPurifier_ConfigSchema_Interchange to an XML format,
+ * which can be further processed to generate documentation.
+ */
+class HTMLPurifier_ConfigSchema_Builder_Xml extends XMLWriter
+{
+
+    /**
+     * @type HTMLPurifier_ConfigSchema_Interchange
+     */
+    protected $interchange;
+
+    /**
+     * @type string
+     */
+    private $namespace;
+
+    /**
+     * @param string $html
+     */
+    protected function writeHTMLDiv($html)
+    {
+        $this->startElement('div');
+
+        $purifier = HTMLPurifier::getInstance();
+        $html = $purifier->purify($html);
+        $this->writeAttribute('xmlns', 'http://www.w3.org/1999/xhtml');
+        $this->writeRaw($html);
+
+        $this->endElement(); // div
+    }
+
+    /**
+     * @param mixed $var
+     * @return string
+     */
+    protected function export($var)
+    {
+        if ($var === array()) {
+            return 'array()';
+        }
+        return var_export($var, true);
+    }
+
+    /**
+     * @param HTMLPurifier_ConfigSchema_Interchange $interchange
+     */
+    public function build($interchange)
+    {
+        // global access, only use as last resort
+        $this->interchange = $interchange;
+
+        $this->setIndent(true);
+        $this->startDocument('1.0', 'UTF-8');
+        $this->startElement('configdoc');
+        $this->writeElement('title', $interchange->name);
+
+        foreach ($interchange->directives as $directive) {
+            $this->buildDirective($directive);
+        }
+
+        if ($this->namespace) {
+            $this->endElement();
+        } // namespace
+
+        $this->endElement(); // configdoc
+        $this->flush();
+    }
+
+    /**
+     * @param HTMLPurifier_ConfigSchema_Interchange_Directive $directive
+     */
+    public function buildDirective($directive)
+    {
+        // Kludge, although I suppose having a notion of a "root namespace"
+        // certainly makes things look nicer when documentation is built.
+        // Depends on things being sorted.
+        if (!$this->namespace || $this->namespace !== $directive->id->getRootNamespace()) {
+            if ($this->namespace) {
+                $this->endElement();
+            } // namespace
+            $this->namespace = $directive->id->getRootNamespace();
+            $this->startElement('namespace');
+            $this->writeAttribute('id', $this->namespace);
+            $this->writeElement('name', $this->namespace);
+        }
+
+        $this->startElement('directive');
+        $this->writeAttribute('id', $directive->id->toString());
+
+        $this->writeElement('name', $directive->id->getDirective());
+
+        $this->startElement('aliases');
+        foreach ($directive->aliases as $alias) {
+            $this->writeElement('alias', $alias->toString());
+        }
+        $this->endElement(); // aliases
+
+        $this->startElement('constraints');
+        if ($directive->version) {
+            $this->writeElement('version', $directive->version);
+        }
+        $this->startElement('type');
+        if ($directive->typeAllowsNull) {
+            $this->writeAttribute('allow-null', 'yes');
+        }
+        $this->text($directive->type);
+        $this->endElement(); // type
+        if ($directive->allowed) {
+            $this->startElement('allowed');
+            foreach ($directive->allowed as $value => $x) {
+                $this->writeElement('value', $value);
+            }
+            $this->endElement(); // allowed
+        }
+        $this->writeElement('default', $this->export($directive->default));
+        $this->writeAttribute('xml:space', 'preserve');
+        if ($directive->external) {
+            $this->startElement('external');
+            foreach ($directive->external as $project) {
+                $this->writeElement('project', $project);
+            }
+            $this->endElement();
+        }
+        $this->endElement(); // constraints
+
+        if ($directive->deprecatedVersion) {
+            $this->startElement('deprecated');
+            $this->writeElement('version', $directive->deprecatedVersion);
+            $this->writeElement('use', $directive->deprecatedUse->toString());
+            $this->endElement(); // deprecated
+        }
+
+        $this->startElement('description');
+        $this->writeHTMLDiv($directive->description);
+        $this->endElement(); // description
+
+        $this->endElement(); // directive
+    }
+}
+
+// vim: et sw=4 sts=4