replace spectron with playwright, update dependencies including electron update to v16

[khassel]

Changes:

• electron test are rewritten and now using playwright (spectron is deprecated), see Improve test suite by starting electron only when needed #2408
• update dependencies
• update electron from v13 to v16, see electron 16 #2656

[khassel]

tests are failing because github is partially down, will wait until tomorrow and trigger them again ...

[codecov-commenter]

Codecov Report

Merging #2715 (f6f3aa1) into develop (2b87d6e) will increase coverage by 7.63%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2715      +/-   ##
===========================================
+ Coverage    61.83%   69.46%   +7.63%     
===========================================
  Files            8        8              
  Lines          262      262              
===========================================
+ Hits           162      182      +20     
+ Misses         100       80      -20     

Impacted Files	Coverage Δ
js/server.js	87.03% <0.00%> (+1.85%)	⬆️
js/app.js	59.66% <0.00%> (+15.96%)	⬆️

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[MichMich]

Hero! Thank you very much!