Adds functional loudspeakers to the game with a fleshed out construction graph. Adds FilterConstructionGraphStep.cs to facilitate this, allowing you to add entities lacing a list of components, tags, and under a certain size.
Adds an audio for empty loudspeakers.

Removing the payload doesn't currently work.

Added a soundbox prototype, along with a buzzer sounds collection for standard loudspeaker audios.
Loudspeakers now cleanup after themselves when destroyed, and support for interrupting currently playing sounds when starting a new one.