Convert XML metadata files into PHP code

Convert meta.xml and tests.xml into PHP code (Resources/xml2php) to avoid the need of parse and manage PHP files on production.

Resources/data/categories.php

@@ -0,0 +1,76 @@
+<?php
+
+/*
+ * This file is part of "Email Address" library
+ *
+ * © Oscar Cubo Medina <ocubom@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+return array(
+    ISEMAIL_VALID_CATEGORY => array(
+        'value' => 1,
+        'description' => 'Address is valid',
+        'id' => 'ISEMAIL_VALID_CATEGORY',
+        'source' => array(
+            'path' => new \SplFileInfo(dirname(__DIR__) . '/xml/meta.xml'),
+            'line' => 14,
+        ),
+    ),
+    ISEMAIL_DNSWARN => array(
+        'value' => 7,
+        'description' => 'Address is valid but a DNS check was not successful',
+        'id' => 'ISEMAIL_DNSWARN',
+        'source' => array(
+            'path' => new \SplFileInfo(dirname(__DIR__) . '/xml/meta.xml'),
+            'line' => 18,
+        ),
+    ),
+    ISEMAIL_RFC5321 => array(
+        'value' => 15,
+        'description' => 'Address is valid for SMTP but has unusual elements',
+        'id' => 'ISEMAIL_RFC5321',
+        'source' => array(
+            'path' => new \SplFileInfo(dirname(__DIR__) . '/xml/meta.xml'),
+            'line' => 22,
+        ),
+    ),
+    ISEMAIL_CFWS => array(
+        'value' => 31,
+        'description' => 'Address is valid within the message but cannot be used unmodified for the envelope',
+        'id' => 'ISEMAIL_CFWS',
+        'source' => array(
+            'path' => new \SplFileInfo(dirname(__DIR__) . '/xml/meta.xml'),
+            'line' => 26,
+        ),
+    ),
+    ISEMAIL_DEPREC => array(
+        'value' => 63,
+        'description' => 'Address contains deprecated elements but may still be valid in restricted contexts',
+        'id' => 'ISEMAIL_DEPREC',
+        'source' => array(
+            'path' => new \SplFileInfo(dirname(__DIR__) . '/xml/meta.xml'),
+            'line' => 30,
+        ),
+    ),
+    ISEMAIL_RFC5322 => array(
+        'value' => 127,
+        'description' => 'The address is only valid according to the broad definition of RFC 5322. It is otherwise invalid.',
+        'id' => 'ISEMAIL_RFC5322',
+        'source' => array(
+            'path' => new \SplFileInfo(dirname(__DIR__) . '/xml/meta.xml'),
+            'line' => 34,
+        ),
+    ),
+    ISEMAIL_ERR => array(
+        'value' => 255,
+        'description' => 'Address is invalid for any purpose',
+        'id' => 'ISEMAIL_ERR',
+        'source' => array(
+            'path' => new \SplFileInfo(dirname(__DIR__) . '/xml/meta.xml'),
+            'line' => 38,
+        ),
+    ),
+);