- Implement autofocusing on active document switch, requested in https://github.com/k5md/Pocket-Editor-webextension/issues/8
- Empty documents allow inputting text after clicking on any document place, no need to aim for the first line
- Switched way of document ids generation to ensure no duplicates ever possible

- Add quick action buttons, requested ( https://github.com/k5md/Pocket-Editor-webextension/issues/7 )
- Refactor code for improved stability