Version 0.2.2.0

This release is mostly a bugfix release, but with a few new features too.

Full invoice tasks handling refactor

Now there is only one expired task created for an invoice, instead of N (where N is the number of payment methods).

It means that BitcartCC should use less RAM, and also there will be less edge cases and duplicate IPN sent.

Also, to handle some rare cases if gunicorn workers are restarting, we have changed the way background tasks are handled.

Technical details:
The idea is to make every background task, and every asyncio task run in background worker, and not gunicorn ones.

Background worker listens on a redis channel for events, and gunicorn workers publish messages to the channel. Worker parses messages and executes event handlers in separate asyncio tasks.

Fixed local deployment

Now local deployment via .local domains works as before, and it now modifies /etc/hosts in a clever way, avoiding duplicate entries

Other changes

• Admin panel now displays a helpful message when invoice has no payment methods connected
• Fixed recommended fee in case it's unavailable.
• Tor extension now doesn't log always, instead it logs only warnings if something was misconfigured.
• Fixed IPN sending
• Fixed logging in docker environment
• Fixed pagination for id 0
• Added ability to change fiat currency used in the /rate endpoint
• Fixed websockets' internal channel ids clash sometimes