wavPlayer

Please checkout the approperiate branch:

• direct - convert pcm to binary duty cycles on gpio pin
• pcm5102 - write pcm data to pcm5102 chip via gpio pins
• DAC8532 - write pcm data to DAC8532 chip via SPI bus, uses external clock
• alsa - write pcm data to ALSA, I.E. Any device supported by ALSA