Exclude nested items (#784) (#1464)

* This PR impliments the feature request #784.

When a folder is explicit defined in `pyproject.toml` as excluded, all nested data, including subfolder, are excluded. It is no longer neccessary to use the glob `folder/**/*`

* use `Path` instead of `os.path.join` to create string for globbing

* try to fix linting error

* create glob pattern string by concatenating and not using Path

* using `os.path.isdir()`` for checking of explicit excluded name is a folder, because pathlib's `is_dir()` raises in exception under windows of name contains globing characters

* Remove nested data when wildcards where used.

Steps to do this are:
1. expand any wildcard used
2. if expanded path is a folder append  **/* and expand again

* fix linting

* only glob a second time if path is dir

* implement @sdispater 's suggestion for better readability

* fix glob for windows?

* On Windows, testing if a path with a glob is a directory will raise an OSError

* pathlibs  glob function doesn't return the correct case (https://bugs.python.org/issue26655). So switching back to  glob.glob()

* removing obsolete imports