Added path string validation

[AlexKalopsia]

I ran into a couple of situations where streamrip would fail to process the data if the album or the artist included special characters (even one case where the record name had a random trailing empty space).

The format I use is folder_format = "{albumartist}/{year} - {title}", hence an album like 2024 - Cool Name (note trailing space) or 2024 - Hot / Cold (special char) will fail the path creation, since it will try and create C:/2024 - Cool Name /__artwork (not valid, at least on Windows), or could try and split the path like C:/2024 - Hot / Cold/__artwork, and also fail in the process.

The PR just adds a simple string validation to prevent any of those invalid characters, as well as trailing spaces.

Example record with special character
Example record with trailing space

[nathom]

Thanks for the fix. We have a similar function implemented here

streamrip/streamrip/filepath_utils.py

Lines 8 to 13 in 3787bbb

	def clean_filename(fn: str, restrict: bool = False) -> str:
	path = str(sanitize_filename(fn))
	if restrict:
	path = "".join(c for c in path if c in ALLOWED_CHARS)
	return path

Can you use that instead?

[nathom]

Replace validate_str with clean_filename

[nathom]

Looks good to me