Verify bytecode for token addresses

[bogdan-manole]

https://github.com/aeternity/aepp-governance/blob/master/governance-server/src/aeternity.js#L68

[kenodressel]

This would require us to create a new class / flag for tokens and display this in the ui. This exceeds the maintenance scope we have currently planned. Therefore this ticket is on hold.