Building the Books file cache from a static field initializer meant any failure
became a TypeInitializationException, which the runtime caches for the life of
the process and rethrows at every later reader of the type. A USB drive that
started failing mid-session therefore crashed Libation on every launch after
that, in the startup logging, before the window appeared.
See issue #1984.
Co-authored-by: rmcrackan <rmcrackan@gmail.com>
- Configuration.LibationSettingsAreValid is true if Books property exists and is any non-null, non-empty string.
- If LibationSettingsAreValid is false, Libation will prompt user to set up Libation.
- When the main window is shown, Libation checks if the books directory exists, and if it doesn't, user is notified and prompted to change their setting
- When a user tries to liberate or convert a book, Books directory is validated and user notified if it does not exist.
- Add My Music and Local Application Data to known directories
- Make %localappdata%\Libation the default settings folder on *nix machines
- Make %MyMusic%\Libation\Books the default books folder on *nix machines
