Created by: josh-burton
Fixes issues with DateTime import and form date paramaterToString function
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due to the addition of the timemachine library, models were importing ‘DateTime’ when using the core library, which is not a valid import.
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the parameterToString function was copied from the dart2 generator and had some errors when some enums were classes.
CC: @ircecho @swipesight @jaumard @nickmeinhold @amondnet