token for url query string

This patch adds new tokens [query-name] to the tokenSTARTER module that will return the value of the url query field name.

So if the url is http://www.example.com/somepath?nid=4&uid=2 , then [query-nid] would be replaced with 4 and [query-uid] would be replaced with 2.

There have been a couple of requests for something like this in #273893: Argument arg() support in Token and #546958: URL argument placeholder token.