Macro impl_from_interface_event_enum_for_event

macro_rules! impl_from_interface_event_enum_for_event {
    ($outer_type:ty, $outer_variant:path) => { ... };
}

Expands to a conversion given the enclosed event type and outer Event variant.

eg

impl_from_interface_event_enum_for_event!(ObjectEvents, Event::Object);

expands to:

impl From<ObjectEvents> for Event {
    fn from(event_variant: ObjectEvents) -> Event {
        Event::Object(event_variant.into())
    }
}