Add support for "or"

[Teester]

Currently "or" or "|" are ignored when generating a shape so x or y is interpreted as x and y.

Need to decide how to represent "or" in a shape and then how to take "or" into account when comparing the shape to an entity.

[fnielsen]

I suppose that is why, e.g., E303 does not work https://www.wikidata.org/wiki/EntitySchema:E303 ?