Electrumsv-sdk

- Support multiple instances via the `--new` and `--id` flags.
- Allow passing arbitrary cli args to underlying `electrumsv` process
- `electrumsv-sdk start` with no args starts all components similarly
how `electrumsv-sdk stop` with no args stops all components.

- Add Azure pipeline builds and pip wheels for hosting on pypi

- Added a `status_monitor` component for real-time monitoring of
the status of running servers (with the intention of later
displaying this information in the `electrumsv-server`). Status can
be 'Running', 'Stopped', 'Failed'.
- Linux compatibility fixes (generally due to different file locations
and python pip behaviour requiring different command flags).
- `electrumsv-server` extended the BIP270 REST API

- Move installation location to the user `LOCALAPPDATA` directory
(platform dependent) in a directory called `ElectrumSV-SDK`.
- Fixed an issue where the pip wheel doesn't include all required
source files.

- Add `node` subcommand for interacting with the running bitcoin node
with RPC commands (standard bitcoin cli interface). Requires no configuration.

- `electrumsv-server` now has an interactive website and the beginnings of
a supporting REST API for `BIP270` payments.
- Add subcommands `start`, `stop`, `reset` to the `electrumsv-sdk` commandline tool.
- General Refactoring of code base file structure and minor bug fixing