Make R2String string Key enum unique by adding extnesion suffix (+ make extension suffix required)

Sources/ToolCore/StringExtensions.swift

@@ -85,4 +85,8 @@ public extension String {
         blue = String(colorClean.prefix(2))
         return (alpha: alpha, red: red, green: green, blue: blue)
     }
+    
+    func uppercasedFirst() -> String {
+        prefix(1).uppercased() + dropFirst()
+    }
 }