Refactored code and added tests

Vasilis Karlaftisrequested to merge
refactor/split-files into master
  • Code refactoring to split classes into thematic files
  • Added unit tests for each class
  • Updated gitlab-ci to run tests on: a) Python 3.12 for every commit, b) Python 3.9 - 3.13 for merge requests
  • Updated Python requirement on setup.py to >=3.9
  • Bugfix on toggling the Ortho panel when loading MRSI results

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