First implementation of general cut optimizations

[maxnoe]

• tests
• docs
• Option to parallelize, since it takes rather long for fine binning

[codecov]

Codecov Report

Merging #123 (64cca6f) into master (154ad75) will decrease coverage by 3.22%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
- Coverage   86.95%   83.73%   -3.23%     
==========================================
  Files          35       35              
  Lines        1273     1322      +49     
==========================================
  Hits         1107     1107              
- Misses        166      215      +49     

Impacted Files	Coverage Δ
pyirf/cut_optimization.py	0.00% <0.00%> (ø)

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