Initial fixes

[MaxCan-Code]

• Fix Dyalog APL could not initialise because the script file could not be opened #16
• Fix test_apl_proxy_conversions
• Fix APL formatting

[MaxCan-Code]

@rodrigogiraoserrao @rikedyp @xpqz can you review it? Thanks

[rodrigogiraoserrao]

At this point, I'm so removed from this project that I don't feel confident reviewing your PR.

[xpqz]

+1

[rikedyp]

These changes are attached to Rodrigo's refactoring which was never completed and means significant changes to the codebase, including the use of Poetry to manage dependencies. Even if we approve these changes, a user coming to the repository home page isn't going to benefit due to lack of documentation. I'm inclined to cherry pick the script patch into the main branch and then leave the refactoring until somebody is able to better document at least how an end user is supposed to get pynapl working from scratch and better if there were contributing instructions including the use of Poetry, and better yet if the project was made available on pypi as I think was originally intended when the refactoring began.