Update for Tippy JS

[janfaracik]

Updates the plugin to support the new tooltip framework introduced in core jenkinsci/jenkins#6408

Images didn't seem to work for me locally hence the missing image.

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[codecov]

Codecov Report

Merging #1379 (30bd093) into master (2317123) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1379   +/-   ##
=========================================
  Coverage     79.87%   79.87%           
  Complexity     1453     1453           
=========================================
  Files           252      252           
  Lines          5610     5610           
  Branches        428      428           
=========================================
  Hits           4481     4481           
  Misses          978      978           
  Partials        151      151           

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[uhafner]

I tested the new code both in Jenkins 2.372 and in the PR-6408, look good now. In PR-6408 the tooltips are now even staying in the visible area of the screen, thanks to Popper 🎉!

BTW: the missing symbols are fixed in #1380.

[uhafner]

Interesting feature of jelly! I was not aware that one can put server created HTML in a variable!