Feature: Clock widget: timer, stop clock, alarm, time

[sjjh]

Idea: Offer one or maybe four widgets like it often is available in smart phones:

• timer: start (by key combo), enter time span to count down, start counting (direct) (or key combo to start), show remaining time, on zero show flashing 0 (or (configurable?) symbol like tea cup, egg) or continue counting negative over time, config option to play sound on reaching zero
• stop clock: start counting on key combo, show elapsed time counting up, stop counting on key combo and show elapsed time. Either continue continue counting up or start from zero on next key combo. Maybe on next run save and display past result/intermediate result on second led matrix (if available)
• alarm: similar to timer, but enter a time (in 24h format to make it easier?), flash either time or symbol (optional play sound) on reaching time. Maybe allow for different symbols (clock, coffee cup, bed, ...)
• time: show system time, probably left led matrix for hour and right for minutes. Config option for 12 vs. 24h display: default (locale of computer), 12h, 24h.

If we want to go fancy, the timer or alarm could allow for recurring patterns, e.g. repetition oft 50min work time, 10min break time; bed time Sun - Thu 9pm, Fri & Sat 11 pm.