Refactor

[yozik04]

Will introduce some backward incompatible changes to improve code quality

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 73.36957% with 49 lines in your changes missing coverage. Please review.

Project coverage is 69.74%. Comparing base (b369988) to head (c59a256).

Files with missing lines	Patch %	Lines
nextion/client.py	70.96%	45 Missing ⚠️
nextion/console_scripts/upload_firmware.py	0.00%	2 Missing ⚠️
nextion/exceptions.py	90.90%	1 Missing ⚠️
nextion/protocol/nextion.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
+ Coverage   62.83%   69.74%   +6.91%     
==========================================
  Files           8        8              
  Lines         444      476      +32     
==========================================
+ Hits          279      332      +53     
+ Misses        165      144      -21     

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