* small fastapi convertion
* make tip add up to invoice
* make tip add to invoice
* display existing tpos
* clean console logs
* suggestion from @leesalminen
* blacked
- Add new tip % option to TPOS extension.
- When adding a new TPOS, a user can choose 1 or more tip % options to be displayed to the customer.
- When adding a new TPOS, a user can choose a wallet to send all collected tips to.
- UI Refresh on TPOS extension.
- Moved the share button to the top navigation, next to the TPOS name, and changed the icon to a more recognizable one.
- Re-arranged the buttons on the keypad to be more ergonomic.
a big refactor that:
- fixes some issues that might have happened (or not) with asynchronous
reactions to payments;
- paves the way to https://github.com/lnbits/lnbits/issues/121;
- uses more async/await notation which just looks nice; and
- makes it simple(r?) for one extension to modify stuff from other extensions.
