This version adds 2 new settings:
- Close tab after creating or updating a capsule
- Switch to new tab when opening a capsule

* reuse existing overflow tab after background script was turned idle

* Fix edge cases involving specific settings combinations

This is a major version:
* The capsules are still saved as browser bookmarks, but the way capsule metadata are saved changed. Old capsules should work and be progressively converted to the new format.
* The whole extension has been rewritten in Svelte, to improve maintainability.
* New capsule modes:
* one-time capsules: will re-open only once
* advanced capsules: can be tweaked to behave in very specific ways
* New views:
* settings: limit the amount of capsules that can be opened at once (and other settings)
* time schedule: limit the times during the days during which capsules can be open ("don't bother" mode)
* capsules list
* journals

* Fixed issue with multi-windows (https://github.com/maxlath/time-capsule/issues/4)

* changed keyboard shortcut to open the addon popup from Alt-T to Alt-C as the latter was used in English Firefox and to keep the shortcuts consistent among browsers
* fixed French description typo

* Set badge background to dark grey