- display the recorded level of deep sleep rather than a constant
(I hope this works for morpheuz, too!?)
- give light sleep a minimum value, because it's sometimes 0 for Mi Band
- use just one data set, because multiple data sets is not supported
by MPAndroidChart (the way we need it)
Now there is hardly any space between the bars anymore
Also:
- allow scaling x and y axis independently via pinch gesture
- set fixed y max value (1.0) so that the display is stable and
independent of the actual available data
- (at least temporarily) display y labels
The reason is that multiple data sets will always be grouped.
If we add null values to fix the grouping issue, we will still have
space between the bars.
Changed the colors of the Deep-/Light Sleep and Activity datasets.
* Deep sleep has been used as basic color,
* Light sleep is a color that is monochromatically analogous
* Activity is a color triadic to the basic one
- supports zooming an panning
- displays labels for all x-values (= time of day)
- fix deep vs. light sleep constants
- increase activity data buffer size for Mi Band
