Test suite failure feedback

[texodus]

Adds screencap images to test failures for quick debugging.

[codecov-io]

Codecov Report

Merging #735 into master will increase coverage by 0.77%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #735      +/-   ##
==========================================
+ Coverage   92.37%   93.15%   +0.77%     
==========================================
  Files          61       62       +1     
  Lines        2703     3011     +308     
==========================================
+ Hits         2497     2805     +308     
  Misses        206      206

Impacted Files	Coverage Δ
perspective/table/_date_validator.py	87.5% <0%> (-12.5%)	⬇️
perspective/tests/table/test_to_format.py	100% <0%> (ø)	⬆️
perspective/tests/table/test_table.py	100% <0%> (ø)	⬆️
perspective/core/view.py	100% <0%> (ø)
perspective/table/table.py	91.26% <0%> (+0.26%)	⬆️
perspective/tests/table/test_view.py	98.76% <0%> (+0.29%)	⬆️
perspective/table/view_config.py	97.61% <0%> (+1.19%)	⬆️
perspective/table/_data_formatter.py	96.87% <0%> (+1.63%)	⬆️
perspective/table/_accessor.py	92% <0%> (+1.85%)	⬆️
perspective/core/base.py	91.22% <0%> (+1.99%)	⬆️
... and 1 more

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