Support for Omni network

[Sascha-1]

https://coinmarketcap.com/currencies/maidsafecoin/

[prusnak]

Omni is a network built on top of Bitcoin network. It utilises OP_RETURN outputs to transfer tokens.

Currently the biggest tokens built on the Omni network are OMNI, USDT (Tether) and MAID (MaidSafeCoin).

The network could be used via OMNI Trezor wallet - https://trezor.github.io/omni-trezor/ - but this is unofficial.

Omni Explorer: https://omniexplorer.info

[stepmes]

Thanks @Sascha-1 for this input, we're noting it down and will consider it when working on future improvements.