Support vocabulary with mixed case name

[dalito]

Mixed case ?concept scheme? names are not treated correctly everywhere, e.g. see the wrong link-URL on the index page for the vocabulary named dataLevel on https://oggioniale.github.io/elter-vocabularies/

The link to the documentation on GitHub is lower-cased

• https://oggioniale.github.io/elter-vocabularies/dev/datalevel

but should keep the original case

• https://oggioniale.github.io/elter-vocabularies/dev/dataLevel

link to repo

• https://github.com/oggioniale/elter-vocabularies/

Discovered in #235

[dalito]

Currently normalizing to lowercase helps to avoid mistakes. It is not a bug but by design.

So supporting mixed case would be a new feature. I am not yet convinced that it is a good idea.

If it is added, all internal keys for the lookup of idrange.config values should stay case-insensitive. We could store the mixed-case name as a new variable in idrange.config and use it just when producing certain outputs like the docs, URIs etc..