Adds preference unavailable setting to profiles.

Content.Shared/Preferences/PreferenceUnavailableMode.cs

@@ -0,0 +1,20 @@
+namespace Content.Shared.Preferences
+{
+    /// <summary>
+    ///     Specifies behavior when none of the jobs you want are available at round start.
+    /// </summary>
+    public enum PreferenceUnavailableMode
+    {
+        // These enum values HAVE to match the ones in DbPreferenceUnavailableMode in Server.Database.
+
+        /// <summary>
+        ///     Stay in the lobby (if the lobby is enabled).
+        /// </summary>
+        StayInLobby = 0,
+
+        /// <summary>
+        ///     Spawn as overflow role if preference unavailable.
+        /// </summary>
+        SpawnAsOverflow,
+    }
+}