Count VAR as keyword call in length rules

[bhirsz]

Relates #973

Also introduced new way of handling RETURN and [Return] mess (why, just why change class name to one that was assigned for different model just for sake changing it.. ;))

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (873237f) 96.39% compared to head (460dde5) 96.40%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1022   +/-   ##
=======================================
  Coverage   96.39%   96.40%           
=======================================
  Files          37       37           
  Lines        4553     4565   +12     
=======================================
+ Hits         4389     4401   +12     
  Misses        164      164           

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