Make DirectoryObject recognize various init variables

[samwaseda]

I think it's straightforward enough, but this PR is to make DirectoryObject recognise str, Path and DirectoryObject for the directory instantiation.

I guess this is the first one to be merged. Sorry for going back and forth all the time!

[github-actions]

👈 Launch a binder notebook on branch pyiron/pyiron_workflow/file_directory_of_directory_object

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.03% (target: -1.00%)	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (7fcae5f)	3065	2659	86.75%
Head commit (6c1c6f0)	3071 (+6)	2665 (+6)	86.78% (+0.03%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#216)	8	8	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[coveralls]

Pull Request Test Coverage Report for Build 7970400900

Details

• 0 of 8 (100.0%) changed or added relevant lines in 1 file are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.02%) to 91.207%

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Files with Coverage Reduction	New Missed Lines	%
snippets/files.py	4	93.59%

Totals
Change from base Build 7939797536:	0.02%
Covered Lines:	5705
Relevant Lines:	6255

---

💛 - Coveralls

[samwaseda]

@liamhuber I made this project to make a better overview. Hopefully it helps a bit.

[liamhuber]

Missing a test case, but otherwise lgtm

[liamhuber]

Missing the case of instantiation by string

[samwaseda]

Since the distinction won't be needed if DirectoryObject is derived from Path, I close this PR.