FBP-377. Form key support for start event

[valb3r]

Fixes #377

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9d00307) 64.91% compared to head (1af270d) 64.94%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #380      +/-   ##
============================================
+ Coverage     64.91%   64.94%   +0.02%     
- Complexity     1424     1429       +5     
============================================
  Files           226      226              
  Lines          7232     7237       +5     
  Branches        927      927              
============================================
+ Hits           4695     4700       +5     
  Misses         2184     2184              
  Partials        353      353              

Flag	Coverage Δ
unittests	64.94% <100.00%> (+0.02%)	⬆️

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