major update
------------------
- in an attempt to conquer the extreme disorder I created the "get_all_data()" funciton which parses sleep.json, moves.json and meals.json and returns a dict with a subdicts like so { some_date: {steps: no_of_steps, sleep: hours, ... }, ... } and contains, time in bed, sleep duration, sound sleep, light sleep, time awake, cups of coffee and steps
- added coffee data analysis
- added several visualisations and composite visualisations (sleep vs coffee, sleep vs steps, ...)