These two classes are not yet in the public API, as such they are hidden behind
the INTERNAL conditional variable.
Change-Id: I4ac204a600715937ef99d8ff56c4026d06abec3f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3305
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
* Sticky events are events that keep their signal raised, ie. even if
a job is initialized afterwards, it will still be triggered.
* Consolidated naming for external events.
* Events are now registered once they are actually being used. This
allows them to allocate the resources they need to do their thing.
