APU Loudness Meter

Release notes since : - Redesign much of visualizer into GLSL for improved quality and accuracy - Configurable visualization layout - Theme improvements, much improved ‘light’ theme variations - Visual range presets for manual visualization range - Introducing ‘milk mode’ parameter and presets - Theme hints removed from presets - Various fixes and improvements - Fix notification coloring Music credits: Annasara - A Lifetime Rolls By (licensed via Audiio)