[Feature request] Support compressed lossless format - Flac

[inson1]

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Feature description

Add support for compressed lossless format - best candidate would be flac

from leaumar

Exposing the compression level or not is up to you, but in my experience the increased compression levels waste a lot of precious cpu time for barely any gain. I googled a reference example for you.

Why do you want this feature?

Compresed - more space available
Lossless - no unwanted change

Additional information

fixed #7

from SimpleMobileTools/Simple-Voice-Recorder#29