Replace StyleCI to PHP CS Fixer

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌

[codecov]

Codecov Report

❌ Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (2.x@ef98c4c). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/NumericHelper.php	66.66%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             2.x     #163   +/-   ##
======================================
  Coverage       ?   99.16%           
  Complexity     ?      172           
======================================
  Files          ?        7           
  Lines          ?      478           
  Branches       ?        0           
======================================
  Hits           ?      474           
  Misses         ?        4           
  Partials       ?        0           

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