Line class added

[egarciamendez]

Description

An objecte representation of a line.

Fixes #268

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• I have added tests that prove my fix is effective or that my feature works
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• New and existing unit tests pass locally with my changes

[github-actions]

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[bro-wi]

Great improvement on the previous version! Only some minor remarks.

[egarciamendez]

@bro-wi Thanks for your review :-) I have made the changes accordingly