node labels Cypher export

[matt-beanland]

When we have label names with spaces such as "Boundary Agent" the cypher label is incorrect needs space removed "BoundaryAgent'.

[matt-beanland]

Improved Cypher.effective_labels so that all labels are converted to pascal_case, splitting on spaces and ensuring first letter of word is capitalised (leaving others as they are).

For test, Changed Artefact Harmonised json so that label now has a space, but cypher unchanged.