Pass query and body parameters as keyword arguments to handler function

[hjacobs]

Connexion should actually map query parameters (flask.request.args) and body parameters to keyword arguments (including type conversion) and pass them to the handler function directly.

[hjacobs]

This could be done in a "smart" and backwards-compatible way by inspecting the handler function with "inspect.signature" (https://docs.python.org/3/library/inspect.html#inspect.signature) --- i.e. automatically map keyword arguments if the function signature contains them.