Improvements and bug fixes

- Added some more methods to the Instance class to make instance queries
more powerful.
- Fixed a bug where comment nodes were being processed by the
XmlFileReader

XmlFormat/IO/XmlFileReader.cs

@@ -75,6 +75,9 @@ namespace RobloxFiles.XmlFormat
 
             foreach (XmlNode propNode in propsNode.ChildNodes)
             {
+                if (propNode.NodeType == XmlNodeType.Comment)
+                    continue;
+
                 string propType = propNode.Name;
                 XmlNode propName = propNode.Attributes.GetNamedItem("name");