Merge pull request xbrowsersync#253 from xbrowsersync/v1.6.0_i18n

Updated finnish translations.

Updated login form password fields to support Firefox native password…

… features.

Refactored and improved how separators are identified and handled.

Fixed webext bug where cached bookmarks cleared when sync bookmarks t…

…oolbar disabled and local change detected.

Fixed bug in android upgrade process.

Refactored base service classes into abstract classes and removed red…

…undant interfaces.

Refactored shared services structure.

Fixed android bug where new bookmark is not created when out of sync …

…detected and refreshed.

Removed redundant files.
Updated dependencies.

Fixed android bug where new bookmark is not created when out of sync …

…detected and refreshed.

Removed redundant files.
Updated dependencies.

Updated package lock.

Updated firefox manifest min version to 75.

Updated dependencies.

Upgraded build configurations for webpack v5.