Dash button to show Logging enabled

[jstri114]

Have a dash button which will send out a single CAN message when pressed (1 or 0) which will show up in datalogs. This will allow us to "start" a new log without having to cycle LV. Could also make the logger make a new sd card file instead

[mathbrook]

the dash button CAN message can be used to do this

[mathbrook]

we could add a dash light for "logger present"