[Neo4j] Fix for filters clobbering each other

[CarsonF]

{ node: { id: '' } }
{ node: { type: '' } }

The latter wins with former logic. Now each object is converted to a cypher string, then joined together.

In order to this I had to patch more exports out of the library. While I was doing so I added more to replace our pre-existing workarounds for un-exported classes.