OpenCAP Alias Support

[wagslane]

OpenCAP aliases add a lot of convenience when sending and receiving Bitcoin. It is an open source protocol that allows users to share their addresses using an alias.

For instance, "donate$ogdolo.com" is the donation alias for ogdolo.com.

It is really easy to integrate as it is a simple REST API. For starters, we could just implement sending to an OpenCAP alias.

protocol: https://github.com/opencap/protocol

server example: https://ogdolo.com