SKIP level

[eugene-sy]

refs #646

This one adds the ignore inspection level, allowing another way to suppress unneeded inspections along with disable/enable flags.
The level name looks a bit alien to me, but skip is worse. Let me know if you have a better idea of the name.

[codecov-commenter]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (756847b) 87.22% compared to head (523490a) 87.07%.
Report is 10 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #782      +/-   ##
==========================================
- Coverage   87.22%   87.07%   -0.16%     
==========================================
  Files         141      141              
  Lines        1527     1540      +13     
  Branches      254      268      +14     
==========================================
+ Hits         1332     1341       +9     
- Misses        195      199       +4     

Files	Coverage Δ
src/main/scala/com/sksamuel/scapegoat/Level.scala	100.00% <100.00%> (+100.00%)	⬆️
...n/scala/com/sksamuel/scapegoat/Configuration.scala	61.11% <50.00%> (+58.16%)	⬆️
...a/com/sksamuel/scapegoat/io/HtmlReportWriter.scala	0.00% <0.00%> (ø)
...c/main/scala/com/sksamuel/scapegoat/Feedback.scala	88.23% <60.00%> (-5.52%)	⬇️

... and 2 files with indirect coverage changes

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[eugene-sy]

@mccartney do you have a moment to take a look? I'd prefer to have it in before I start working on the config file.

[mccartney]

I don't have any comments. Good stuff.