Header data structure passed to Zenroom on execution

[jaromil]

In order to allow advanced Zencode logics that take into account OS states, time and caller addresses, we need to have a header { ... } dictionary passed as additional data inside KEYS and generated by restroom on execution. Such a dictionary should contain:

header = { epoch = "string",
                 client_ipv4 = "string",
                 url_path = "string"
                 machine_id = "string",
                 random_seed = "string",
                 exec_sequence = integer
                }

I can further explain, lets meet over this