New properties

I would like to propose that the language SC consider adding the following top-level properties to all commands:

id (UUIDv4)

created (timestamp)

creator or author or something  (an ID to a STIX Identifier or some sort of other identity)

We should also have some sort of serial number as well.  So that if you have a command with and ID of 1234 and you issue that command to 400 systems, you will need some way of knowing which systems / serial numbers accepted and processed that command successfully.

Bret