Related to 

- #56
- https://github.com/bazel-contrib/bazel-gazelle/blob/master/internal/gazelle.bash.in
- https://github.com/keith/rules_multirun/blob/main/internal/constants.bzl

This way you can use `$(BINDIR)` and it will be correctly replaced

This allows you to use:

```bzl
arguments = ["$$(rlocation $(rlocationpath :foo))"],
environment = {"FOO": "$$(rlocation $(rlocationpath :foo))"},
```

To handle issues with path resolution when also cd'ing into the
workspace root, manually or with `run_from_workspace_root = True`.
Previously doing `$(location` or any other variant wouldn't work for
external tools in this case because the path would be something like
`external/foo/bar` which wouldn't exist in the root of the repo.

These arguments don't get full shell escaping anymore but that should be
fine and is something the user has to handle instead