Red Alert CashTicks

Three options for cash ticks:
Extreme: current behavoir (every cash countdown tick is heard)
Normal: RedAlert countdown style (only one cash countdown tick every ~1 or 2 seconds)
Disabled: No cash tickdown or tickup is heard.

Thanks to Tirili for hints on the settings system.

OpenRA.Game/GameRules/Settings.cs

@@ -19,6 +19,9 @@ using OpenRA.Server;
 
 namespace OpenRA.GameRules
 {
+	public enum MouseScrollType { Disabled, Standard, Inverted }
+	public enum SoundCashTicks { Disabled, Normal, Extreme }
+
 	public class ServerSettings
 	{
 		public string Name = "OpenRA Game";
@@ -77,6 +80,8 @@ namespace OpenRA.GameRules
 		public bool Repeat = false;
 		public bool ShellmapMusic = true;
 		public string Engine = "AL";
+		
+		public SoundCashTicks SoundCashTickType = SoundCashTicks.Extreme;
 	}
 
 	public class PlayerSettings
@@ -86,8 +91,6 @@ namespace OpenRA.GameRules
 		public string LastServer = "localhost:1234";
 	}
 
-	public enum MouseScrollType { Disabled, Standard, Inverted }
-
 	public class GameSettings
 	{
 		public string[] Mods = { "ra" };