1.5.0-dev1036

Add Xml parsing support to js platform (#3105)

* First pass at adding Xml parsing support to js platform

Likely still need to add tests and samples

* Add JS to Parser Node and Element converter

Mirrors native impl by returning empty strings when content is unavailable

Moves MalformedXMLException out of native code, useful for common case.

* Remove unneeded null checks in Parser

Last commit handled null management

* Add newlines for code linter

* Fix namespaceUri bug

Undo accidental capture of localName

Also remove unneeded null check

* Undo grade.properies change

Had to disable webpack version number property to run sample

* Clean up NodeImpl comments

Corrected description

* Make NodeList impl lazy

Generates only when needed, serves cache after