Multiple address lookup

Changes

• Adds in multiple node support for finding addresses.

Mapping / Address api

Changes

This adds in an address and mapping api. Under the hood this is how Aracari keeps track of nodes, and to do more precise operations with Aracari you need to be able to access these addresses and mappings. The be able to pass these addresses back into the system to select the precise nodes. This release adds some methods to make this easier.