Better Sleep-Tracking

[derfelix42]

Improve old and "temporary" sleep tracking system by introducing sleep sessions (like in task_history).

A sleep session will have a start and end time.

Timetable: continue using wakeup/sleep bars, but add black (#000) full size background to indicate sleep block.

[derfelix42]

Add a Sleep-Tracker Interface

• start / stop sleep-session
• add past sleep-session
• set default sleep times
• see history + time slept
• edit sessions in history

[derfelix42]

Open Bugs:

• [ ] Sleep-time of last weeks Sunday gets displayed on current weeks Sunday / same for Monday wrap