ConstructionComponent.AttackBy tries calling TryProcessStep on the forward step of the construction stage, and if that fails it tries the backwards step. I many construction prototypes the backwards step is null for all stages and so clicking the construction ghost with an invalid step results in a crash due to the step passed to TryProcessStep being null.
Requires https://github.com/space-wizards/space-station-14/pull/768
- [x] Play sounds
- [x] SoundSchedules actually work
- [x] Send sound to specific users
- [x] Make existing components use SoundComponent
- [x] Add ScheduledSounds from prototypes
- [x] Add Play methods equivalent to those of AudioSystem.
- [x] Document most code.
