On the basis that's as close as we can get to the beta for now.
Still has HAL issues.

One local change to MicroPython was needed to include mphal.h in
modspeech - need to review how this works for the non-sim build as it
seems like it should be included.

Audio format needs some investigation - MediaRecorder might not be the
right approach.

We'll still need to resample them and write them to the buffer.

Closes #101

Needs testing but likely closes #110

…/micropython-microbit-v2-simulator into beta-updates

Edge cases need checking. Requires a higher AUDIO_CHUNK_SIZE which has
other consequences but 4ms is too short.

…/micropython-microbit-v2-simulator into beta-updates

- Fix missing typescript types
- Use Safari 13 compatible OfflineAudioContext constructor - this may
  prove pointless due to lack of < 44100 sample rate support, but is an
  easier starting point to try things out.

by stopping micStream tracks

Passing this.microphone.microphoneOn/Off functions as BoardAudio constructors in  board/index.ts didn't work for some reasons. The microphone element was flagged as being undefined. So instead I passed the element directly into the BoardAudio constructor, which worked.

Enable a larger audio buffer

- Use smaller buffer to avoid too much audio after wait=True
- Don't reset nextStartTime to avoid overlapping audio
- Add indirection to callback so we can clear it properly to avoid
  calling it when audio finishes after MicroPython has terminated

Remove our workaround