Library for TAP and TZX (ZX Spectrum tape image) files decoding to audio

Using to generate 44.1 kHz, mono, 16 or 8 bit, PCM audio stream:

	file, err := tzx.OpenFile(tap_or_tzx_file_name)
	if err != nil {
		panic("Error open file")
	}

	...

	freq := 44100 // Audio frequency

	// Setup processing pipeline
	// Convert to desired sample size and write out
	sw := tzx.CreateBitstreamWriter(<bits-per-sample>, target_stream)

	// Optional, apply some audio stream filters to pipeline
	sw = tzx.CreateBassFilter(freq, sw)

	// Generate audio stream
	file.GenerateAudioTo(sw, freq,
    		func(s string) {  // Trace each block description. May be nil.
    			println(s)
    		})