Add support for timezones

[Deuchnord]

Q	A
Bug fix?	no
New feature?	yes
Related issues	Fix #45
Has BC-break	no
License	GNU AGPL-v3

[codecov]

Codecov Report

Merging #51 into features will decrease coverage by 0.41%.
The diff coverage is 83.05%.

@@             Coverage Diff              @@
##           features      #51      +/-   ##
============================================
- Coverage      82.3%   81.88%   -0.42%     
============================================
  Files             8        8              
  Lines           469      508      +39     
  Branches         70       81      +11     
============================================
+ Hits            386      416      +30     
- Misses           74       77       +3     
- Partials          9       15       +6

Impacted Files	Coverage Δ
kosmorrolib/data.py	88.15% <100%> (ø)	⬆️
kosmorrolib/ephemerides.py	55.14% <100%> (+1.29%)	⬆️
kosmorrolib/events.py	100% <100%> (ø)	⬆️
kosmorrolib/core.py	90.9% <100%> (ø)	⬆️
kosmorrolib/dumper.py	86.76% <80%> (-2.53%)	⬇️

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[Deuchnord]

To do:

• add the timezone information in the PDF output
• add the date in text and PDF output when the hour with timezone applied is on the date before or after