perf: remove copying of audio buffer before encrypting

[Fluiser]

Removing meaningless allocation and copying memory.

Communication with the system is expensive.

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[braindigitalis]

is this fully tested, with both send and receive of data, and mixing audio?

the data copies are not meaningless at all and are required to prevent buffers overwriting themselves inside opus and sodium - please ensure everything works correctly.

I do not think this is safe.

[braindigitalis]

please ensure unit tests pass and that a sample program is written to show this. you removed the pull request template text so I have no way of knowing if this was done.

[Mishura4]

According to the sodium docs, the buffers can overlap. However yes it would be good to confirm everything still works.

[Mishura4]

I've also renamed the PR to comply with the coding style standards.