Fixes #225 - Use a properly defined user agent

* Set a proper user agent
* Add fallback when UA comes out nil
* Remove unused Bundle extension
* Return nil when asciification fails
* Add whitespace handling and further emoji test case
* Explicitly check if string is already in ASCII
* Rename factory to builder
* Use allSatisfy instead of reduce
* Use key path syntax

ElementX/Sources/Other/Extensions/String.swift

@@ -51,4 +51,22 @@ extension String {
         }
         return abs(hash)
     }
+    
+    var isASCII: Bool {
+        allSatisfy(\.isASCII)
+    }
+    
+    func asciified() -> String? {
+        guard !isASCII else {
+            return self
+        }
+        guard !canBeConverted(to: .ascii) else {
+            return nil
+        }
+        let mutableString = NSMutableString(string: self)
+        guard CFStringTransform(mutableString, nil, "Any-Latin; Latin-ASCII; [:^ASCII:] Remove" as CFString, false) else {
+            return nil
+        }
+        return mutableString.trimmingCharacters(in: .whitespaces)
+    }
 }