Last few misc fixes for !input

- Make it master-only, because of improvements we don't need owner permission anymore
- Add case-insensitivty to Enum.TryParse()
- Add missing strings

ArchiSteamFarm/Localization/Strings.Designer.cs

@@ -774,6 +774,15 @@ namespace ArchiSteamFarm.Localization {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to This function is available only in headless mode!.
+        /// </summary>
+        internal static string ErrorFunctionOnlyInHeadlessMode {
+            get {
+                return ResourceManager.GetString("ErrorFunctionOnlyInHeadlessMode", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Global config could not be loaded, please make sure that {0} exists and is valid! Follow setting up guide on the wiki if you&apos;re confused..
         /// </summary>

ArchiSteamFarm/Localization/Strings.resx

@@ -707,4 +707,7 @@ StackTrace:
   <data name="BotStatusLocked" xml:space="preserve">
     <value>Bot is locked and can't drop any cards through idling.</value>
   </data>
+  <data name="ErrorFunctionOnlyInHeadlessMode" xml:space="preserve">
+    <value>This function is available only in headless mode!</value>
+  </data>
 </root>