Rename Paths to Files

[Masynchin]

Paths are either directory or file, but our Paths contains only files. For example, ExtensionPaths can operate only at files, but this is not marked anyhow. Instead, it should be File and Files interfaces, and no Paths.

ndnt/ndnt/paths.py

Lines 32 to 43 in 091c121

	class ExtensionPaths(Paths):
	"""Extension paths.
	Paths with certain extension.
	"""
	def __init__(self, origin: Paths, extension: Extension):
	self.origin = origin
	self.extension = extension
	def __iter__(self) -> Iterable[Path]:
	return filter(lambda path: self.extension == path.suffix, self.origin)