Add better web response handling

Namespace updates
Add UsState class for fetching abbreviations
Add new test method
Add additional error handling utility methods
Remove unused singletons
Address validation stubs
Add new address validation test stubs
Add void functionality to Shipment entity

Add DELETE support to Request.cs
64 bit long Shipment Id changes

Add DefaultLong to BaseEntity
Add VoidShipment test logic
Fix assertion logic in VoidShipment test method