Advanced Tracking

[MichaelHolley]

Let users log how much time they spend on each habit, not just whether they did it. This option should be optional and can be added on creating or activated afterwards.

This means that both simple ([YYYY-MM-DD]) and advanced ([{time: X, date: Y}]) shall be supported at the same time.

This should also affect the HistoryComponent active-color opacity, comparable to the github tracker.

Further options:

• time spent (45 minutes, ...)
• count (12345 steps, 15 pages read, ...)