Expand support for service dataflows

[stevespringett]

Currently, services that communicate with other services can be represented as dependencies (which is correct), the data flow and classification can be specified, but the URIs describing other services or URLs are not currently possible.

[stevespringett]

In addition, trustZone, name, and description are added, and minor refactoring necessary. In the XML schema, some deprecation was required along with adding a new dataflow introduced in 1.5 for representing the data. Both work.

These changes make CDX more compatible with OpenThreatModel (OTM)