ESP8266 phone

Still work in progress.

• Recording in the ESP8266 and listening in the browser is working.
• Recording in the Browser and listening in the ESP8266 is working.
• openlpc is fully working, it can
  • decode hola.lpc and
    • send the data over http ( /decode.raw )
    • play the audio using i2s ( /PlayHolaLPC )
  • encode hola.raw and
    • send the data over http ( /encode.lpc )
    • record from the mic and send it via socket ( /index.html )

notes:

• the I2S needs this pull request esp8266/Arduino#3995
• you can play hola.raw using
  • /PlayHolaRaw (data is sent to the i2s byte by byte)
  • /PlayHolaRawBuf (data is sent to the i2s in chucks, more efficient!)
• I measured the sampling rate of the I2S and turned to be slower than 8Khz, this causes dropped packets.
• recording and playing still doesn't work.