w/ another -fsanitize=address hint, use separate objects instead of
relying on pattern itself holding everything api *may* need
combine pattern and preset patterns currently separate timers
pattern container reworked to allow small-size optimization
introduce a special '0,0' marker, repeating the whole pattern (instead
of just one delay at the end)
since pattern is part of the led struct proper, display it in settings query
update tests & reuse time parsing routines from utils