Use AudioWorklet to record microphone input

[MrBearman64]

Replace old dependency using ScriptNode Processor with AudioWorklet to record microphone input. This is a solution for Issue #141.

• recorder.js contains the AudioWorklet and sends audio packets via postMessage
• voice.js loads AudioWorklet, receives audio packets of recorder.js and forwards them to the voice pipeline
• voice.js also discards voice packets that needed too long between the postMessage of recorder.js and the recorderNode.port.onMessage in voice.js. This delay is hard-coded.
• package.json contains new dep to load AudioWorklet
• webpack.config.js includes AudioWorklet into the build process