fix get with url as function and improve all documentation
fix get with url as function and improve all documentation

The url function was read like an variable for
`getAllChoiceRecognitions` and `getChoiceRecognitionByID`. They are both
refactored to use url as function.

Added also the function to create an choice recognition to the API.

Added extensive documentation for the its-ws-server functions.

itslanguage/itslanguage-js,itslanguage/itslanguage-js