Limit which groups and users can use audio commands

[fm1randa]

Is your feature request related to a problem? Please describe.
Yes. Some audios may be particular to a closed group and may need clarification for others.

Describe the solution you'd like
To have the ability to choose which users or groups can trigger audio commands.

Describe alternatives you've considered
There isn't an alternative.

Proposal
Include a new 'flag' property in the User collection named canUseAudioCommands.