Add AT command to switch on/off certain buzzer beeps

[benjaminaigner]

As requested by a user, we could implement a command to switch on or off different kinds of tone outputs:

• sip / puff
• enter or exit strong sip / puff
• calib
• change slot
• IR receive / send
• BT pairing

Suggestion: "tone off" AT TO 0011001100 (each bit indicates one tone type)

EDIT: we should implement this for this repository as well as FMv2