refactor all the audio stuff into classes and a separate file

htdocs/lib/AudioProcessor.js

@@ -1,9 +1,8 @@
 class OwrxAudioProcessor extends AudioWorkletProcessor {
     constructor(options){
         super(options);
-        this.maxLength = options.processorOptions.maxLength;
         // initialize ringbuffer, make sure it aligns with the expected buffer size of 128
-        this.bufferSize = Math.round(sampleRate * this.maxLength / 128) * 128
+        this.bufferSize = Math.round(options.processorOptions.maxBufferSize / 128) * 128
         this.audioBuffer = new Float32Array(this.bufferSize);
         this.inPos = 0;
         this.outPos = 0;