Requirements, imports and code conventions update

[Kriplingo]

Changes consist of:

• General cleaning up of the code and enforcement of newly defined guidelines using autopep8, which can be found in the pyproject.toml file.
• Removal of unnecassary dependencies listed in the pyproject.toml file, accompanied by update of the requirements.txt to fit these changes
• Removal of unused import statements within all the existing python and jupyter notebook files.
• Implementation of pre-commit configuration, that will automatically edit the code in order to conform to the new guidelines