Refactor id t

[bkryza]

Fixes #281

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 91.55313% with 31 lines in your changes missing coverage. Please review.

Project coverage is 86.82%. Comparing base (e21c2d2) to head (cfea6d9).

Files	Patch %	Lines
...quence_diagram/visitor/translation_unit_visitor.cc	87.50%	10 Missing ⚠️
.../class_diagram/visitor/translation_unit_visitor.cc	81.81%	6 Missing ⚠️
src/common/clang_utils.cc	53.84%	6 Missing ⚠️
...gram/generators/json/sequence_diagram_generator.cc	92.72%	4 Missing ⚠️
src/common/types.cc	90.62%	3 Missing ⚠️
src/common/model/diagram.h	0.00%	1 Missing ⚠️
src/common/visitor/ast_id_mapper.cc	85.71%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #285      +/-   ##
==========================================
- Coverage   86.84%   86.82%   -0.02%     
==========================================
  Files         122      122              
  Lines       13687    13754      +67     
==========================================
+ Hits        11886    11942      +56     
- Misses       1801     1812      +11     

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