Refactor: new class HitFilter for filtering analysis hits

[osma]

No description provided.

[codecov]

Codecov Report

Merging #88 into master will increase coverage by 0.08%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
+ Coverage   95.39%   95.47%   +0.08%     
==========================================
  Files          29       30       +1     
  Lines        1129     1150      +21     
==========================================
+ Hits         1077     1098      +21     
  Misses         52       52

Impacted Files	Coverage Δ
annif/project.py	92.98% <100%> (-0.41%)	⬇️
annif/hit.py	100% <100%> (ø)	⬆️
tests/test_hit.py	100% <100%> (ø)

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[coveralls]

Coverage increased (+0.08%) to 95.478% when pulling 470dcb4 on hit-filter into cf85a32 on master.

[coveralls]

Coverage increased (+0.08%) to 95.478% when pulling 470dcb4 on hit-filter into cf85a32 on master.