Modernize packaging (2.x only)

[dalito]

In NFDI4Cat we are using pyLODE 2.x because of its SKOS/vocpub support and have not looked into 3.x. Therefore, this PR is against 2.x.

The packaging changes can be seen in isolation in https://github.com/dalito/pyLODE/pull/1.

This PR also

• adds using URIs as fragment IDs for vocpub.
• fixes a problem that a trailing slash can prevent to generate a title for a link.

The commits isolate the changes. Pick what you need/want.

The changes make pylode pipx-installable. So installation gets very simple (for example my windows log):

C:\Users\dlinke
λ pipx install git+https://github.com/dalito/pyLODE.git@nfdi4cat-2.x
  installed package pylode 2.13.4.dev6+g7272f97, installed using Python 3.11.5
  These apps are now globally available
    - pylode.exe
done! ✨ � ✨

C:\Users\dlinke
λ pylode
usage: pylode [-h] [[-i INPUTFILE | -u URL |] -lp] [-p PROFILE] [-c {true,false}] [-cs {true,false}] [-co {true,false}]
              [-o OUTPUTFILE] [-f {html,md,adoc}] [-log {debug,info,warning,error}] [-l LANGUAGE] [-v]
pylode: error: An ontology source (-i/--inputfile or -u/--url) is required

C:\Users\dlinke
λ pylode -v
2.13.4.dev6+g7272f97

[dalito]

Since this PR is not directly usable for the 3.x-line I close this. The modernized packaging could be taken over to a new PR.