refactor: unify runtime sets, update naming of event channels (#17)

Some general refactors:
Turns HeroPartySO into a runtime set class.
Make runtime set an IEnumerable
Simplify name of events

Reviewed-on: #17
Reviewed-by: zephyr <zephyr@noreply.localhost>
Co-authored-by: Michael <mep053@gmail.com>
Co-committed-by: Michael <mep053@gmail.com>

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