Massive cleanup and violation fixing

docs/objects/Library.yaml

@@ -36,10 +36,8 @@ components:
           example: false
         autoScanCronExpression:
           description: The cron expression for when to automatically scan the library folders. If null, automatic scanning will be disabled.
-          oneOf:
-            - type: string
-            - type: boolean
-            - type: null
+          type: string
+          nullable: true
           example: '0 0 0 * * *'
         audiobooksOnly:
           description: Whether the library should ignore ebook files and only allow ebook files to be supplementary.