Audio Reactive enhanced versions of "Fireworks", "Fireworks Starburst", "Popcorn" (back-ported from WLED-SR)

This was a prove-of-concept for making audio-responsive versions of standard effects, and we almost forgot about it 😅

• The concept works for many effects that use some "random trigger"
• trigger events (popcorn pop, etc) are synchronised with audio onsets. As our peak detection still needs improvements, Audio volume is used as a second trigger condition.
• effects slowly suspend in silence

The perfect feature for New Years Eve 👍

• clap your hands -> popcorn
• hear a rocket explode -> starburst