Rework audio backend

[OznOg]

Handling of the audio backend selection is quite complicated and does not allow to test the backend withour restart. This PR should allow it.

[Baklap4]

@OznOg the build contains a couple failures on Windows and MacOS

Converting this to Draft + in progress for now

[OznOg]

Gents, this is still draft, I'm trying to address #671, and #417 and maybe #160 at some point... review those at your own risks, I may completely rewrite any part of this MR.

[Lord-Kamina]

The build failure on Mac is probably cause you forgot to #include <stringstream>

[github-actions[bot]]

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[Lord-Kamina]

Gents, this is still draft, I'm trying to address #671, and #417 and maybe #160 at some point... review those at your own risks, I may completely rewrite any part of this MR.

I don't think there's anything to be done for #160.