path bindings

[naturallymitchell]

• basename
  https://doc.rust-lang.org/std/path/struct.Path.html#method.file_stem

• absolute path
  https://github.com/foundpatterns/gut/blob/558f361eb62de566deecb883ef3b78307ccb6476/extras.lua#L19-L27
  https://ruby-doc.org/core-2.5.3/File.html#method-c-expand_path

see also #1

[dariusc93]

fs::canonicalize is implemented in which can be used for absolute path. I just rebase one of my branches and will be pushing in a few

Implemented in 47024c6

Leaving issue open for a short time in case there is any comments on it.