Implement .on(type, callback) method in Interactives Controller

Supported events are "resize" and "modelLoaded". It's cleaner and
similar to solution used in modeler.

D3 dispatcher is not used (yet?). It enforces to use classes for
multiple listeners of a signle event, what won't work with the rest of
current implementation.
Remove layoutStyle argument from InteractivesController constructor

This option was depreciated and not used anymore.
Remove depreciated fitToParent option from view options