Windows fails with an OSError when `somepath.resolve()` is called and
`somepath` contains a glob pattern. As a workaround, we now `resolve()`
the parent directory, and put the filename at its end. This only works
when the glob pattern is in the filename, which is the case for BAT-
generated globs.
This does introduce some not-so-nice things, like having to annotate each
`__init__` function with `-> None`. However, the benefits of having static
type checking in a complex bit of software like BAT outweigh the downsides.
