feat: Improvements for audio subsystem

Increased minimum space in buffer for audio write
When not playing audio, decrease update rate
Decreased priority of other tasks

tickworker.py

@@ -56,11 +56,11 @@ walle.setup()
 
 
 def walle_tick():
-    scheduler.enter(INTERVAL_TICK, 1, walle_tick)
+    scheduler.enter(INTERVAL_TICK, 3, walle_tick)
     walle.tick()
 
 
-scheduler.enter(INTERVAL_TICK, 1, walle_tick)
+scheduler.enter(INTERVAL_TICK, 3, walle_tick)
 
 audio.queue_sound('walle.boot')