Imports of package internal

PathSynopsis
github.com/gohugoio/hugo/common/hashingPackage hashing provides common hashing utilities.
github.com/gohugoio/hugo/common/paths
pathPackage path implements utility routines for manipulating slash-separated paths.
path/filepathPackage filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.