Homogeneise capital List, Dict typing

[atriaybagur]

This change breaks the code for Python 3.5 to 3.8.
I see there is a bit of a mix of use of these two ways of setting this:

I understand we are assuming Python 12+, this is probably not the only incompatibility we are creating with earlier Python versions, but I think it is worth establishing a standard on how to define these type hints.

https://stackoverflow.com/questions/72101566/should-i-use-a-capital-l-list-for-type-hinting-in-python-3-9#72101634

Originally posted by @garciadias in #162 (comment)

[passionworkeer]

Adding rom future import annotations at the top of files allows using the lowercase list / dict syntax while maintaining backward compatibility with Python 3.7+. This is the modern standard (PEP 585) and avoids version-specific type hinting issues.