Improve layout of checks markup

[uhafner]

Improves several aspects of the checks layout:

• Use a more compact layout for the summary and details pane using tables.
• Add a trend emoji indicator that shows if the project is improving or not.
• Show the reference build that is used to compute the new warnings.
• Add an optional option to show all warnings as annotations (and not only the new ones)

[codecov]

Codecov Report

Merging #724 (9c1dcce) into master (f641419) will increase coverage by 0.09%.
The diff coverage is 94.64%.

@@             Coverage Diff              @@
##             master     #724      +/-   ##
============================================
+ Coverage     79.63%   79.73%   +0.09%     
- Complexity     1506     1521      +15     
============================================
  Files           241      241              
  Lines          5520     5560      +40     
  Branches        403      409       +6     
============================================
+ Hits           4396     4433      +37     
- Misses          962      964       +2     
- Partials        162      163       +1     

Impacted Files	Coverage Δ	Complexity Δ
...plugins/analysis/core/steps/PublishIssuesStep.java	56.79% <40.00%> (-0.81%)	30.00 <1.00> (+1.00)	⬇️
...ns/plugins/analysis/core/steps/IssuesRecorder.java	67.87% <100.00%> (+0.52%)	83.00 <2.00> (+3.00)
.../plugins/analysis/core/steps/RecordIssuesStep.java	56.18% <100.00%> (+0.92%)	42.00 <2.00> (+2.00)
...ns/analysis/core/steps/WarningChecksPublisher.java	98.14% <100.00%> (+0.64%)	31.00 <11.00> (+9.00)

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