Feature/add option to remove manga from categories when removing from library (#633)

* Optionally remove manga categories when removing them from library

* Use "Mangas::removeFromLibrary"

* Handle uncatched promises

src/util/metadataServerSettings.ts

@@ -20,6 +20,7 @@ export const getDefaultSettings = (): MetadataServerSettings => ({
     // library
     showAddToLibraryCategorySelectDialog: true,
     ignoreFilters: false,
+    removeMangaFromCategories: false,
 });
 
 const getMetadataServerSettingsWithDefaultFallback = (