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E-book viewer: Make the Table of Contents panel a dockable window so it can be moved around and even made into a separate floating window

Also refactor the viewer's ui code to not use Qt Designer.
E-book viewer: Resize the metadata overlay view when the viewer window is resized
E-book viewer: Make the list of bookmarks a dockable window that can be kept open while reading the book
Viewer: Fix positioning of full screen labels when dock windows are present
Refactoring
Add a context menu to the bookmarks view to sort bookmarks by name or book position
Update Maximum PC
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