Ability to use media keys with Pico over USB HID

Looks like I'd need to register the Pico as a Consumer Device (but not too sure what's involved with that)

Compromise for now is to use a AutoHotkey script to control multimedia functions:

[#NoEnv](https://forum.espruino.com/search/?q=%23NoEnv)  ; Recommended for performance and compatibility with future AutoHotkey releases.
; [#Warn](https://forum.espruino.com/search/?q=%23Warn)  ; Enable warnings to assist with detecting common errors.
SendMode Input  ; Recommended for new scripts due to its superior speed and reliability.
SetWorkingDir %A_ScriptDir%  ; Ensures a consistent starting directory.

; AutoHotkey Media Keys
!M::Send   {Media_Play_Pause}
^!Left::Send        {Media_Prev}
^!Right::Send       {Media_Next}
^!NumpadMult::Send  {Volume_Mute}
^!NumpadAdd::Send   {Volume_Up}
^!NumpadSub::Send   {Volume_Down}  

Along with my Pico script:

let kb = require("USBKeyboard");
let debug = 0;
let code = 0;
let timeout;
let lastTime;
// function to do something with the code when we get it
function handleCode() {
  timeout = undefined;
  if (debug) print(code);
  LED2.write(true);
  switch(code) {
    case 16712445: {
      console.log('Volume +');
      kb.setModifiers(kb.MODIFY.CTRL, function() {
        kb.tap(kb.KEY.F12);
      });
      break;
    }
    case 16750695: {
      console.log('Volume -');
      kb.setModifiers(kb.MODIFY.CTRL, function() {
        kb.tap(kb.KEY.F11);
      });
      break;
    }
    case 16754775: {
      console.log('Play/Pause');
      kb.setModifiers(kb.MODIFY.ALT, function() {
        kb.tap(kb.KEY.M);
      });
      break;
    }
    case 16720605: {
      console.log('Mute');
      kb.setModifiers(kb.MODIFY.CTRL, function() {
        kb.tap(kb.KEY.F10);
      });
      break;
    }
    case 16748655: {
      console.log('Skip');
      kb.setModifiers(kb.MODIFY.SHIFT, function() {
        kb.tap(kb.KEY.N);
      });
      break;
    }
    case 16738455: {
      console.log('Prev desktop');
      kb.setModifiers(kb.MODIFY.SHIFT, function() {
        kb.setModifiers(kb.MODIFY.GUI, function() {
          kb.tap(kb.KEY.LEFT);
        });
      });
      break;
    }
    case 16756815: {
      console.log('Next desktop');
      kb.setModifiers(kb.MODIFY.GUI, function() {
        kb.setModifiers(kb.MODIFY.SHIFT, function() {
          kb.tap(kb.KEY.RIGHT);
        });
      });
      break;
    }
    case 16753245: {
      console.log('Lock');
      kb.setModifiers(kb.MODIFY.GUI, function() {
        kb.tap(kb.KEY.L);
      });
      break;
    }
    default: {
      //console.log('default');
    }
    kb.setModifiers(0, function() {});
  }
  code = 0;
  LED2.write(false);
}

function onPulseOn(e) {
  code = (code*2) | ((e.time - lastTime) > 0.0008);
  if (timeout!==undefined) clearTimeout(timeout);
  timeout = setTimeout(handleCode, 20);
  lastTime = e.time;
}

function onPulseOff(e) {
  lastTime = e.time;
}

setWatch(onPulseOff, A5, { repeat:true, edge:"rising" });
setWatch(onPulseOn, A5, { repeat:true, edge:"falling" });

setWatch(function(e) {
  debug = !debug;
  console.log(`Debug mode ${debug ? 'on' : 'off' }`);
}, BTN, { repeat: true });