handle timezone and recurring events

[eigenmannmartin]

reimplementation of #90
closes #89

kudos to @RickMeasham and @tresni

I have manually counted all entries in outlook for the test_cest case. :-)

[codecov]

Codecov Report

Merging #95 (b7062ab) into master (c368ad8) will increase coverage by 2.18%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   87.84%   90.02%   +2.18%     
==========================================
  Files           4        4              
  Lines         362      381      +19     
  Branches       93       97       +4     
==========================================
+ Hits          318      343      +25     
+ Misses         21       17       -4     
+ Partials       23       21       -2     

Impacted Files	Coverage Δ
icalevents/icalparser.py	91.00% <93.33%> (+2.85%)	⬆️

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[patrick-sb]

Hi @eigenmannmartin - we ran into the same errors that your PR fixes (thanks!), and noticed that it wasn't being merged. We've decided to fork the repo at https://github.com/teamsurfboard/icalevents because we're depending on it in prod - if you'd like to copy your PR over then we'd be happy to merge it.