rename blink method into blink_all

this renaming is mandatory as i wish to add a new fonctionnality that aimed at let only one specified color to blik
add "C" command that make the current status blinking
lightOnLeds refactoring

the new "currentStatus" allows us to simplify the call required to light a set of leds representing a status.
refactoring

remove unused code (lighOffLeds)
rename status into level in operateLed* in order to not mingle htis status with currentStatus
general refactoring to improve readibility