Icon for the menu button, which triggers book tree reload
Tree reload is now automatically triggered when new books are added, or existing books are deleted
Cover images for the books are now saved as byte streams directly in the .dat files
Moved the Book class for he book grid into a separate file
Cover image in the book edit now correctly saves and loads from the .dat file
More various fixes
Added dialog for the selection of the library location
Large amount of various code changes
Usage of .dat files to store book data info was dropped and replaced with sqlite database file
Version bumped to 2.0 due to large amount of changes