Refactorings

[kba]

Refactorings from #566:

• ValidationReport is moved to ocrd_models
• task_sequence and validate test cases decoupled (reduces redundant tests)

Refactoring from #559:

• move helper methods (run_cli et al) from ocrd/processor/base.py to ocrd/processor/helpers.py

[codecov-commenter]

Codecov Report

Merging #573 into master will increase coverage by 0.04%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master     #573      +/-   ##
==========================================
+ Coverage   84.15%   84.19%   +0.04%     
==========================================
  Files          48       49       +1     
  Lines        2752     2759       +7     
  Branches      538      538              
==========================================
+ Hits         2316     2323       +7     
  Misses        339      339              
  Partials       97       97              

Impacted Files	Coverage Δ
ocrd_models/ocrd_models/report.py	100.00% <ø> (ø)
ocrd_validators/ocrd_validators/__init__.py	100.00% <ø> (ø)
ocrd/ocrd/processor/helpers.py	90.32% <90.32%> (ø)
ocrd/ocrd/processor/__init__.py	100.00% <100.00%> (ø)
ocrd/ocrd/processor/base.py	95.91% <100.00%> (+3.53%)	⬆️
ocrd_models/ocrd_models/__init__.py	100.00% <100.00%> (ø)
ocrd_validators/ocrd_validators/json_validator.py	100.00% <100.00%> (ø)
...d_validators/ocrd_validators/ocrd_zip_validator.py	100.00% <100.00%> (ø)
ocrd_validators/ocrd_validators/page_validator.py	77.19% <100.00%> (ø)
..._validators/ocrd_validators/workspace_validator.py	84.06% <100.00%> (ø)
... and 2 more

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