MetadataDialog now clears series information when series checkbox is unchecked
Tweaked PreferencesDialog
Refactored MetadataDialogController code
Adjusted PreferencesDialog.xib interface
Removed unneeded comments from PreferencesDialogController
Tweaked preferences interface
Removed unnecessary SwitchView method in PreferencesDialogController
Modified MetadataDialog interface
Tweaked MetadataDialog interface
Tweaked PreferencesDialog interface
Moved LightWindow & LightDialog files into a Widets folder
Moved LightDialog textures into textures folder in Light Dialog directory
Removed SwitchView method from AboutDialog
Added first credits to Credits.txt
Moved LightDialog to Widgets folder
BookID can no longer be null
Refactored LibraryFileManager & tests