Add more file properties, organize storage, add video block

CHDataManagement/Extensions/String+Extensions.swift

@@ -95,8 +95,10 @@ extension String {
 
     /**
      Split the string at the first occurence of the separator
+
+     If the String does not contain the separator, then `before` will contain the whole string, and `after` will be empty
      */
-    func splitAtFirst(_ separator: String) -> (String, String) {
+    func splitAtFirst(_ separator: String) -> (before: String, after: String) {
         let parts = components(separatedBy: separator)
         return (parts.first!, parts.dropFirst().joined(separator: separator))
     }