Bugfix/kbdev 1133 incorrect matching

[mathieulemieux]

See https://www.bcgsc.ca/jira/browse/KBDEV-1133.

Introducing type filterring earlier in the matching process.
Had to refactor the structural variant screening.

This PR is fixing the "wrong type" issue regarding matching same position. A workaround makes sure that delins will still be matched to the more specific types deletion or insertion.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6114071) 90.33% compared to head (6771fb4) 90.43%.
Report is 17 commits behind head on master.

❗ Current head 6771fb4 differs from pull request most recent head a7465b9. Consider uploading reports for the commit a7465b9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #108      +/-   ##
==========================================
+ Coverage   90.33%   90.43%   +0.10%     
==========================================
  Files           8        8              
  Lines         838      847       +9     
==========================================
+ Hits          757      766       +9     
  Misses         81       81              

Flag	Coverage Δ
unittests	90.43% <100.00%> (+0.10%)	⬆️

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