Model Types

Any Model can be used as a Type
Example: Casting Questionnaire, part 1, based on A Respectful Calm
Show how to create first the Model, then use it in a Property
Actually creates a Type based on that Model, but you usually don't care about that
In principle, allows you to create arbitrarily complex data types in Querki
The _foreachProperty function
Not heavily tested yet; please report bugs if you find any