Set remaining mypy setting to true

[pacrob]

What was wrong?

Tighten up typing!

Closes #101

How was it fixed?

Set mypy rules disallow_any_generics, disallow_subclassing_any and disallow_untyped_decorators to true, fix errors

Todo:

• [x] Clean up commit history
• [x] Add or update documentation related to these changes
• [x] Add entry to the release notes

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