Build an Env out of Request (and optional SessionGet/SessionSet lambdas)
It will add the the following filters to the reqeust:
* Null-Check (prevents null values dropping from extern into jWebform (jWebform tries to avoid using null))
* Trims the input (that means: Leading and traling spaces will be deleted from the input !!
The result of a form.run
It contains all infos, that is needed to get the entered values, the validation results and if the form was submitted correctly.