Add a new symbol as icon

[uhafner]

Replace the existing SVG with a themeable symbol.

[codecov]

Codecov Report

Merging #453 (fe99186) into master (d12d10f) will not change coverage.
The diff coverage is 33.33%.

❗ Current head fe99186 differs from pull request most recent head e71ae0a. Consider uploading reports for the commit e71ae0a to get more accurate results

@@            Coverage Diff            @@
##             master     #453   +/-   ##
=========================================
  Coverage     72.46%   72.46%           
  Complexity     1005     1005           
=========================================
  Files            87       87           
  Lines          3741     3741           
  Branches        435      435           
=========================================
  Hits           2711     2711           
  Misses          884      884           
  Partials        146      146           

Impacted Files	Coverage Δ
...kins/plugins/coverage/model/CoverageJobAction.java	50.00% <0.00%> (ø)
...ns/plugins/coverage/model/CoverageBuildAction.java	78.72% <50.00%> (ø)

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