Support for saving named requests in variables and improved json parsing

[bleaphar]

This PR introduces variable support for the kernel and changes the flow of Json grandchildren parsing

Highlights:

• HandleAsync looks if a submit code has the entire associated document in which case it will use that in creating declared variables which enables the support for saving the named request values in variables
• Changed the chaining of the Json parsing that at the last node to evaluate one of the derived types and then convert to a string
• Miscellaneous reformatting in the request parser