Fix syncing
Shrink screenshots
Update internal libraries
Various bug fixes

- Fix locales broken in 1.5.16
- Update CodeMirror editor

* Lots of UI updates
* Editor improvements with bookmarking, scrolling & autocomplete
* Lots of bug fixes

* Disabled Dropbox in sync feature in bugged Chromium versions.
* Include colon in autocomplete selection.
* Add unlimited storage permission:

IndexedDB storage may be evicted by the browser at its discretion [1].
Granting the unlimitedStorage permission ensures that IndexedDB data
will not be evicted [2], and allows the extension to store more than
5MB of data if needed [3].

[1]: https://web.dev/storage-for-the-web/#eviction
[2]: https://crbug.com/680392#c5
[3]: https://developer.chrome.com/apps/declare_permissions#unlimitedStorage

* Using <kbd>Ctrl</kbd>+<kbd>F</kbd> focuses search field in manager.
* Update CSSLint & made various parser fixes.
* Translations:
* Updated various languages.
* Add Korean translation.
* Add hotkey & right-click to beautify silently.
* Increase userstyles style search timeout.
* Various other code fixes.

* Fix Firefox shortcuts buttons
* Fix infinite loop in `colorizeInvisible`
* CM scrollbar pointer-events

- Fix for userstyle installer
- Fix for subdomain searches
- Include iframes in "write styles for" in the popup
- Updated locales

Fixed the white flash of unstyled content (FOUC), found using Firefox multi-account containers & in Chrome Canary.
Fixed manager not showing the update button after updating.

* Colorpicker works with non-hex values again.
* Revert script injection changes to fix flash of white.
* Layout improvements.

* Fixed issue with "Turn all styles off".
* Prevent installing duplicate styles from USO.
* Simplified exclusions & use dialogs to configure.
* Auto-resize section editor.
* Stylelint now ignores Stylus language at-rules.
* Other various fixes.

* Various bug fixes:
* Prevent javascript errors.
* Iframe issues.
* Live preview problems.
* Installing from USO.
* Beautify options are now persistent.

* Fix Dropbox blocked from working on new installs.
* Fix accessibility issues.
* Fix save template.
* Fix editor focusing.
* Fix inline search for Vivaldi.

* Fix usercss install error.
* Show style update error.
* Fix inline searching.
* Fix detection of CSP.
* Fix dynamic changing of manager options.
* Fix cursor moving between multiple editors.
* Fix beautify adding extra carriage returns.
* Allow `/!*` comments in UserCSS metadata.
* Miscellaneous bug fixes.

* Implement Dropbox import/export (requiring the addition of the "identity" permission).
* Refactor storage system.
* Improved import performance.
* Fix popup inline install/uninstall.
* Fix update button & interaction with userstyles.org.
* Add color validation to UserCSS meta variables.

* Fixed update button on userstyles.org.
* UserCSS settings now select all text on focus.
* UserCSS added number & range variables, and default option indicator.
* Rewrote linter system; UserCSS metadata is now included.
* Editor page now properly refreshes.
* Updated CodeMirror.

* Fixed a bug with toggling styles in the popup using the Spacebar key
* Fixed a bug with Turn-all-styles-off being ignored on initial page load

* Set style's textContent in page context in FF59+
* Updated CodeMirror to v5.40.
* Updated locales.
* Various trivial bug fixes and improvements.

* Various fixes for narrow (mobile) UI
* "Preserve new lines" option is added to beautifier in the editor
* Buttons to restore/clone/move a section in the standard style editor
* UserCSS style URLs can have ? after .user.css like dropbox URLs
* UserCSS preprocessor LESS updated to 3.8.1
* UserCSS site is now optional in @author
* UserCSS will no longer overwrite existing styles when saving a new one
* UserCSS now properly sets placeholder for empty `@name`
* Fixes to a few issues with the "applies to" editor inputs.
* Highlight edited style on history back (Firefox).
* Add live reload message when unavailable.
* Supress stylelint warning for Stylus language `@css` block.
* Add "Translate" link to manager.
* Apply style to more iframes (Firefox).
* Display #RGBA swatches in the editor correctly even in old browsers.
* Show update all button on individual check too.
* Fix CSSLint issue with <text-decoration-color>.
* Fix a rare issue with colorpicker positioning.

Style installation in the popup is working again.

Style search in the popup is functional again.

Trivial bugfixes
Switched "Shortcuts" to "Wiki" in the popup

Fixed a bug in colorpicker when switching the format

Various trivial bugfixes.