Refactor - rename getObjectVars() to getAttributesInternal()

[Tigrov]

Q	A
Is bugfix?	✔️/❌
New feature?	❌
Breaks BC?	❌
Fixed issues	#308

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 88.10%. Comparing base (1564264) to head (cb518db).

Files	Patch %	Lines
src/AbstractActiveRecord.php	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #347      +/-   ##
============================================
+ Coverage     87.16%   88.10%   +0.93%     
+ Complexity      607      599       -8     
============================================
  Files            13       13              
  Lines          1395     1379      -16     
============================================
- Hits           1216     1215       -1     
+ Misses          179      164      -15     

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