rework some of QueryMakers api.

instead of calling startXQuery (which never made much sense to me as a construct, as it doesn't actually begin a query) create a new method, setQueryType that takes an enum of various types.

In the future we may want to transform this into a bitfield and allow for constructs like setQueryType( Artist | Album ) but thats a future question.

This will allow for the removal of the enums in most private classes that do this same thing at some point in the future