- Change hp_pulse to not be framerate dependent
- Change some of the HpFloater checks to be inside the find() function
- Remove unnecessary join
- Add back option for showing incoming damage + add option for
experience accumulation
- Change `ExpFloater`s to not store the owner, as they are only shown
for the player (will have to see if the implementation is correct so
that it may be applied to the other floaters)
- Rename `Outcome::Damage` to `Outcome::HealthChange` and `DamageInfo`
to `HealthChangeInfo`
- Update some outdated comments/documentation
