Add node edge support to DatabaseWrapper and use generic Node and NodeEdge instead of PrototypeNode

[GregoryConrad]

Thoughts:

• Separate table for edges
  • That table just has ID, startNodeID (foreign key), stopNodeID (foreign key)
• Current table will remain similar without much modification

[GregoryConrad]

Make the update, delete, and add all have return values. int for udpate and delete, bool for add

[GregoryConrad]

extract the big chunk of property setting in statement code to a new method as per IntelliJ's weak warning suggestion