Improve files module

[isHarryh]

Summary

This PR makes code quality improvements to the files module, such as type hints and typo corrections.

Commit Details

1. fix: better type hint in EndianBinaryReader/Writer

In EndianBinaryReader, use -> Tuple[xxx, ...] instead of -> Tuple[xxx], where the latter one is a common mistake.

In EndianBinaryWriter, use value: Sequence instead of value: list because some invocations pass a tuple argument instead of list.

2. refactor(files): use assertion for version-specific assignment

Use assert xxx is not None before value assignment.

This is also the practice adopted by MeshHelper and other classes, which can correctly satisfy the NoneType checking.

3. chore(files): fix typo and remove legacy code

In File class:

• class File(object) can be simplified to class File (Python 3).
• self.environment = self.environment = ... causes a duplicated self-assignment.

In ContainerHelper, method __or__ cannot be used anymore since 5ac0a62 changed the constructor of this class.

4. fix(files): overall type hint corrections

Correct the type hints in the files module.

Refactors BundleFile.get_version_tuple:

• Uses (next(...), next(...), next(...)) instead of tuple(map(...)) to respect the returned type -> Tuple[int, int, int].
• Prevents AttributeError by validating the regex match before accessing groups.