Add raw device support and integer ("bitperfect") output to Core Audio backend#226

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tokyovigilante wants to merge 9 commits intoandrewrk:masterfrom

tokyovigilante:coreaudio-raw

Commits on Nov 23, 2019

Add support for packed 24 bit LE format
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Add raw device enumeration to Core Audio backend
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Add support for changing HW IO buffer size (required for 24 bit packed audio)
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[WIP] enumerate raw devices efficiently and identify devices supporting integer IO
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Delete private API for Core Audio integer mode
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Add support for enumerating Core Audio HAL virtual formats
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Update documentation and add flag for Core Audio output streams which have a matching device output format (i.e. can perform bit-perfect IO)
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Remove debug logging and implement hardware stream volume support
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Destroy device if HW format changes during raw mode playback
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