Add support for cold staking addresses

[aguycalled]

• Allow to send coins to cold staking addresses
• Recognise cold staking scripts
• Track ownership of cold staking utxos
• Spend cold staking outputs (solving the script)
• Create cold staking address

[proletesseract]

i believe this is resolved in release https://github.com/Encrypt-S/NavPay/releases/tag/v4.6.0

[proletesseract]

wait, this ticket is after that release, re-opening

[aguycalled]

Allow to send coins to cold staking addresses needs Encrypt-S/bitcore-lib#5

[mxaddict]

I think these are still missing:

Allow to send coins to cold staking addresses
Create cold staking address

[proletesseract]

okay cool. ill see if i can prioritise these.

[aguycalled]

Encrypt-S/bitcore-lib#5 has been succesfully tested by @sakdeniz, he manually integrated the patch in the bitcore-lib he uses for next lite

[mxaddict]

We also need

Sign a message with keys