Added Effect Handling, and reordered a set for lint

[caymansimpson]

Issue here

This just removes Effects when they silently get removed in the true battle state, but Showdown doesn't send you a log. Like all effects, testing is quite manual and maintenance is hard given that each effect is typically a unique edge-case.

However, this is 95% there and unblocks reverse speed/damage calculation

I also reordered items added to a set in abstract_battle to be consistent

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.38%. Comparing base (f458350) to head (6068970).
Report is 65 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #593      +/-   ##
==========================================
+ Coverage   83.38%   85.38%   +2.00%     
==========================================
  Files          39       42       +3     
  Lines        3918     4298     +380     
==========================================
+ Hits         3267     3670     +403     
+ Misses        651      628      -23     

[hsahovic]

Thanks @caymansimpson !