Use predefined sources of modules to search for source code

[uhafner]

Uses the predefined sources value of the Cobertura XML file, so that the source code files will be found by Jenkins.

Additionally, upgrades the coverage-model to 0.19.1 that contains the fix for #599.

[codecov]

Codecov Report

Merging #603 (da2779f) into master (232fc3d) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #603      +/-   ##
============================================
+ Coverage     72.32%   72.35%   +0.03%     
  Complexity     1575     1575              
============================================
  Files           127      127              
  Lines          6059     6067       +8     
  Branches        637      637              
============================================
+ Hits           4382     4390       +8     
  Misses         1456     1456              
  Partials        221      221              

Impacted Files	Coverage Δ
...ugins/coverage/metrics/steps/CoverageRecorder.java	79.42% <100.00%> (+0.98%)	⬆️

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