Add a toggle for colorblind friendly progress bar colors (#25318)

* Add a toggle for progress bar colors

* yeah this thing

* PJB review

* optimization

Content.Shared/CCVar/CCVars.cs

@@ -1578,6 +1578,13 @@ namespace Content.Shared.CCVar
         public static readonly CVarDef<float> ScreenShakeIntensity =
             CVarDef.Create("accessibility.screen_shake_intensity", 1f, CVar.CLIENTONLY | CVar.ARCHIVE);
 
+        /// <summary>
+        /// A generic toggle for various visual effects that are color sensitive.
+        /// As of 2/16/24, only applies to progress bar colors.
+        /// </summary>
+        public static readonly CVarDef<bool> AccessibilityColorblindFriendly =
+            CVarDef.Create("accessibility.colorblind_friendly", false, CVar.CLIENTONLY | CVar.ARCHIVE);
+
         /*
          * CHAT
          */