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.
Carry positions between sibling EPUBs even without an audiobook, and keep
narration markers on the read-along file only. Point the KOReader book panel
and hold release at the copy devices sync, and label EPUB-only sync in the
read-aloud panel.
Fixes#1508
neon