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Viewer: Do not forget the ToC open on start preference if viewer opened with a book that has no ToC
Edit Book: In the right click menu, do not show cut/copy/undo/redo items if they are disabled
Add an ICU based implementation of swapcase()
Edit Book: Allow changing the case of selected text by right clicking and choosing the appropriate change case action. Fixes #1353263 [[Enhancement] - add Change Case functionality to Edit Book](https://bugs.launchpad.net/calibre/+bug/1353263)
Use ICU for case change operations in line edits
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Edit Book: Fix position syncing and Live CSS not working if the opening tag is split over multiple lines
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Driver for Kiano Booky Light. Fixes #1353893 [calibre doesn't see the device, Kiano Booky Light](https://bugs.launchpad.net/calibre/+bug/1353893)
E-book viewer: Allow reloading the current book by pressing F5 or Ctrl+R. Fixes #1354059 [[feature-request] reload ePub file in ebook-viewer](https://bugs.launchpad.net/calibre/+bug/1354059)
version 1.48.0