Fix issues with counting keyword calls in blocks or with new syntax

[bhirsz]

Fixed:

• the keyword calls are now properly counted inside IFs, inline IFs, TRY EXCEPT blocks
• new RF 5.0 syntax is now also counted towards keyword calls (such as BREAK, CONTINUE, RETURN statements)

Fixes #629

[codecov-commenter]

Codecov Report

Base: 97.22% // Head: 97.23% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (defe2f3) compared to base (e6a83b3).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #704      +/-   ##
==========================================
+ Coverage   97.22%   97.23%   +0.01%     
==========================================
  Files          24       24              
  Lines        2996     3007      +11     
==========================================
+ Hits         2913     2924      +11     
  Misses         83       83              

Impacted Files	Coverage Δ
robocop/checkers/lengths.py	98.42% <100.00%> (+0.09%)	⬆️

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