Enhancement: add possibility to enable/disable audio

[MatthieuLeboeuf]

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Description

Possibility to enable/disable audio with the vboxmanage command : modifyvm name --audio-enabled off

Use Case(s)

Actually, the sound variable sets the audio driver to null if the content is none, but leave the audio enabled.

Potential configuration

if sound = "none" use --audio-enabled off
else use --audio-enabled on and use --audio-driver to set the correct driver

Potential References