[Ready] SoundComponent (#164)

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.

Content.Shared/GameObjects/ContentNetIDs.cs

@@ -14,5 +14,6 @@
         public const uint SPECIES = 1009;
         public const uint RANGED_WEAPON = 1010;
         public const uint CAMERA_RECOIL = 1011;
+        public const uint SOUND = 1012;
     }
 }