80 testing objects

[mopichalova]

This pull request aims to close #80. The primary focus is on cleaning up testing objects, unifying model representations, and improving the overall organization of code.

Changes:

Testing objects cleanup

• testing objects relocated to objects_testing.py to reduce redundancy
• parsers creation also in objects_testing.py

Text models defined in files

• text models and regulations identified and moved to text files
• get_model_str to easily load text models

[xtrojak]

That is an excellent job, thank you for this @mopichalova!
Just address the minor issues and we are good to go :)

[mopichalova]

I also added missing objects and text models for test_vector_model.txt in the commit 7944c7e.