Add blackout button

[Flohhhhh]

Add a blackout smart button to work with #6.

• disables headlights and taillights
• disables specified extras (already implemented)
• disables real-brake-lights script

Method for disabling real brake lights script:

• add events to the script to disable and enable the effect
• call even from ULC
• possibly make it re-enable when the vehicle starts moving?
• add a command and keybinding in real-brake-lights to control this manually (this one has nothing to do with ULC) (well, maybe if it's re-enabled in the other script ULC needs to know about that)

[Flohhhhh]

Created command, button may have to wait until #6