DatePicker, TimePicker + calendar app

[codecov[bot]]

Codecov Report

Merging #115 into devel will increase coverage by 0.89%. The diff coverage is 69.94%.

@@            Coverage Diff             @@
##            devel     #115      +/-   ##
==========================================
+ Coverage   28.19%   29.08%   +0.89%     
==========================================
  Files         209      214       +5     
  Lines       16375    16731     +356     
==========================================
+ Hits         4617     4867     +250     
- Misses      11758    11864     +106

Impacted Files	Coverage Δ
ui/__init__.py	100% <100%> (ø)	:arrow_up:
ui/time_picker.py	56.94% <56.94%> (ø)
ui/date_picker.py	66.42% <66.42%> (ø)
apps/calendar/main.py	71.42% <71.42%> (ø)
ui/tests/test_time_picker.py	74.07% <74.07%> (ø)
ui/tests/test_date_picker.py	83.33% <83.33%> (ø)
... and 2 more

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[CRImier]

@derivmug I decided to improve navigation: if you're on Monday and press LEFT, it should go to previous Sunday - same for reverse. I added it, had to change the code internally a little bit - also, did some changes for better maintainability.

TODO:

• If you're on first week and press UP, it should go to previous month (same weekday) - same for reverse. Couldn't figure it out yet, guess we need to add an internal function.

Also, you changed the calendar app to use TimePicker, I suggest you just create a new app in apps/example_apps next time. Changed it back in the meantime.

[CRImier]

Merging this for now, #101 has some more TODOs.