[ADD/WIP] Continue MUCwerk

oh man this is gonna be painful to do... xmpp is fine iff youre doing
DMs isnt it?

src/XML/Elements.c

@@ -110,3 +110,24 @@ XMLFreeElement(XMLElement *element)
 
     Free(element);
 }
+XMLElement *
+XMLookForUnique(XMLElement *parent, char *tag)
+{
+    size_t i;
+
+    if (!parent || !tag)
+    {
+        return NULL;
+    }
+
+    for (i = 0; i < ArraySize(parent->children); i++)
+    {
+        XMLElement *child = ArrayGet(parent->children, i);
+        if (StrEquals(child->name, tag))
+        {
+            return child;
+        }
+    }
+
+    return NULL;
+}