Squash of feat/koreader-widget-board. KOReader plugin 2.0.0 gets the widget-board dashboard, redesigned
book details, menus, lists and dialogs, Decor page and reading companions. Highlights, notes and bookmarks
now stay in step across web, Kobo, KOReader and the phones (defects D-00 to D-20, migration 0121), and
reading progress and narration hand off cleanly between devices.
Add two-way bookmark sync support between KOReader plugin and server. Include migration 0056 for bookmark sync columns, server endpoints and services for bookmark exchange, and KOReader plugin bookmark management with comprehensive unit and E2E tests.