added DATE_AND_TIME Value as Datetime object (#312)
added DATE_AND_TIME Value as Datetime object (#312)

* added DATE_AND_TIME Value as Datetime object

added function to get DATE_AND_TIME value as datetime Object 
and updated  get_dt to use this function

* Fix error

* implemented  pycodecsytle  fixes

replace lamba with internal function   to implement pycodecsytle  proposal
gijzelaerr/python-snap7