Support legacy onset behavior for presets.
Add an amplitude follower preset that draws the VU meter / amplitude of an audio source around its position in space.
Add a beat/vumeter proof of concept for the feature-based presets.
Rename beat/vumeter presets to PositionPulser and PositionDonutParticles. Refactor the way that features are received. Create a class called AudioEmitter for holding features.
Add protection for when there is no active preset.
Merge branch 'echodome'
Updated backdrop for readability.