Handle game event change situation in lobby queue

rc_core/src/persist/settings.rs

@@ -74,6 +74,16 @@ pub struct ServerSettings {
     pub database: String,
     #[serde(default)]
     pub auto_signup: bool,
+    #[serde(default)]
+    pub queue_mode: QueueMode,
+}
+
+#[derive(Serialize, Deserialize, Clone, Debug, Default)]
+pub enum QueueMode {
+    Upgrade, // move enqueued players into newer gamemode
+    #[default]
+    Notify, // send match change
+    Ignore, // do nothing
 }
 
 fn default_db_conn() -> String {
@@ -84,5 +94,6 @@ fn default_server_conf() -> ServerSettings {
     ServerSettings {
         database: default_db_conn(),
         auto_signup: false,
+        queue_mode: QueueMode::Notify,
     }
 }