update of props vocab

[lzehl]

solves: #7

and more: added missing reverse link names, added a few missing descriptions

still working on it but feedback @apdavison @olinux @Raphael-Gazzotti is already welcome

[apdavison]

As a general suggestion, could you take the reverse names from fairgraph as a starting point?

This will make it easier to maintain consistency in future. If you don't like the fairgraph choice of reverse name, I'm happy to discuss.

I should also note that fairgraph sometimes uses different reverse names depending on the type where the reverse property is used. I'd like to discuss whether this is something we should support in openMINDS, or whether we take it as a sign that some properties should be split (i.e. having several, more specific properties rather than one property with a generic name).