Allow dataview to return a string

Dataviews can be used in combination with NPE & NanoFlows to generate temporary information.

Often times creating objects to store strings is overkill and makes your model overly complex.

This is especially true when using a data view to trigger a JSA.

It would be nice if a Dataview was not forced to return an object, and could return just a string.

edit: microflowtimer widget also needs an object in order to work