Make early launches a cvar (#10213)

Apparently our LRP playerbase sucks.

Content.Shared/CCVar/CCVars.cs

@@ -886,6 +886,12 @@ namespace Content.Shared.CCVar
          * Emergency
          */
 
+        /// <summary>
+        /// Is the emergency shuttle allowed to be early launched.
+        /// </summary>
+        public static readonly CVarDef<bool> EmergencyEarlyLaunchAllowed =
+            CVarDef.Create("shuttle.emergency_early_launch_allowed", false, CVar.SERVERONLY);
+
         /// <summary>
         /// How long the emergency shuttle remains docked with the station, in seconds.
         /// </summary>