Improvements to OpenSL ES unit test slesTestRecBuffQueue

Add support for float, 32-bit, and 8-bit formats
Write file in .wav format instead of raw
Use printf instead of fprintf to stdout
Use fprintf stderr for errors
Change default capture rate from 22.05 to 48 kHz
Remove sox cheat sheet
Use option for specifying the record time in seconds
Start adding multi-channel index masks (incomplete)

Change-Id: I934a2ec8413415c1e1f958ed1657e4070ef10783