smp flavor, network id manifest declaragtions

[vladiuz1]

According to discussion here https://github.com/arrayio/array-io-client/wiki/One-key-per-window#discussion we need to add a manifest declaration with a list of allowed SMP flavours:
example:

[possible-SMPs: [flavour: 'btc'], [flavour: 'eth', network_id: 'ropsten']]