CLI flag to give P2 the controller

src/config.rs

@@ -43,6 +43,9 @@ pub struct CliArgs {
     /// Automatically open Player 2 for multiplayer
     #[arg(long)]
     pub player2: bool,
+    /// Map the first connected controller to Player 2
+    #[arg(long)]
+    pub player2_controller: bool,
 }
 
 pub const COLOR_PRESETS: [[Color32; 2]; 3] = [