Updated code style, type annotations, no overiding built-ins

[IceWizard7]

Type annotations

• Add type annotations to functions (e.g. def run(args: typing.Any) -> None:)
• Add '_' in front of unused variables (e.g. def run(_args: typing.Any) -> None:)

No overiding built-ins

• Use command_help: str = ... instead of help

Unnecessary imports

• Remove unnecessary imports (e.g. os)

New commands

• Add rename.py command

Code style

• Add newlines, consistent usage of tabs & spaces, etc.

[IceWizard7]

plz add me as contributer in the readme lol

[jacklak-redstone]

LGTM

[jacklak-redstone]

Hold on. The rename command will crash when only given 1 arg. Also, os.rename is a much cleaner way to do this.

[IceWizard7]

Uhh thanks for noticing. Ima look into it in a bit.

[IceWizard7]

It's now using os.rename, thanks!