Enable writing WAV files with 64-bit floats
Enable writing WAV files with 64-bit floats

Add 64-bit floating-point to the list of encodings supported by WAV.

CaptainHayashi/sox,cbagwell/sox,CaptainHayashi/sox,cbagwell/sox,uklauer/sox,CaptainHayashi/sox,pcqpcq/sox,uklauer/sox,pcqpcq/sox,cbagwell/sox,pcqpcq/sox,cbagwell/sox,pcqpcq/sox,uklauer/sox,uklauer/sox,CaptainHayashi/sox