Offer an option to use a custom post type for Schema Type Event

[janwidmer]

Currently, the Schema Type Event is bound to a custom Post Type, which get's created as soon as this schema type get's activated.

Since I am using several different Event Type via Custom Post Types my own, that does not really work for me. Additionally, I am using Advanced Custom fields to define additional Properties for my events.

The ideal case would be, that I could choose on which Custom Post Type I want to render the Event Schema Type. Additionally It would be great, if I could assign all event schema properties to a resolver function, where I could provide the ACF get_field function name and the property name to use..

Would you accept a PR if I would build this enhancement?