Add more file properties, organize storage, add video block

CHDataManagement/Generator/ImageVersion.swift

@@ -41,6 +41,14 @@ struct ImageVersion {
     var outputPath: String {
         image.outputPath(width: maximumWidth, height: maximumHeight, type: type)
     }
+
+    var wasPreviouslyGenerated: Bool {
+        image.generatedImageVersions.contains(versionId)
+    }
+
+    func wasNowGenerated() {
+        image.generatedImageVersions.insert(versionId)
+    }
 }
 
 extension ImageVersion: Identifiable {