[FEATURE] Add speech functionality

[1Blademaster]

• Have a setting where this can be toggled on or off.
• When toggled on, it should announce things such as arming/disarming, flight mode changes
• Have options to announce EKF going into orange/red, announcing statustext messages (based on severity I guess), low battery
• Further options of announcing some data periodically, e.g. altitude every 5 seconds