Data egress via audio

[TonyWildish-BH]

The penetration testing report showed that (page 21):

Narration tools available by default could be used to exfiltrate data from the environment, whereby an attacker could leverage speech to text tools to convert to its original format.

This can be addressed via Guacamole, by setting disable-audio to true in the guacamole.properties file.

It would also be useful to allow the possibility of enabling audio, if needed for accessibility purposes.

This is a medium level risk, but is something we must fix before the next pen-test.