Bitcoin altcoin plugin and wallet environment

[olemis]

Feature description

Bitcoin altcoin plugin and wallet environment

Is your feature request related to a problem? Please describe. No support for Bitcoin in wallet.

Describe the solution you'd like Initial classes and entry points for integrating Bitcoin accounts into FiberCrypto wallet.

Possible implementation

• [ ] Initial implementation of Bitcoin altcoin plugin
• [ ] Implement wallet environment (and storage) compatible with Electrum file format
• [ ] Not implemented placeholders for the other main classes