Overhaul core Tracker: extract scrape handler

[josecelano]

Overhaul core Tracker: extract scrape handler.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.31%. Comparing base (731fd01) to head (3867bbb).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1206      +/-   ##
===========================================
- Coverage    78.40%   78.31%   -0.10%     
===========================================
  Files          191      192       +1     
  Lines        13097    13145      +48     
  Branches     13097    13145      +48     
===========================================
+ Hits         10269    10294      +25     
- Misses        2668     2685      +17     
- Partials       160      166       +6     

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[josecelano]

ACK 3867bbb