Add flipper logic

src/logic/ingame/playerlogic.rs

@@ -147,6 +147,13 @@ pub fn update_player_movement(
     // Only do this if the mouse is far enough away
     let player_stunned = game_core.player.stun_timer > 0.0;
     let mut player_real_movement = game_core.player.direction * speed_multiplier;
+
+    // Handle the player wearing flippers
+    if game_core.player.inventory.flippers.is_some() {
+        player_real_movement *= game_core.player.inventory.flippers.as_ref().unwrap().speed_increase;
+    }
+
+    // Handle movement and collisions
     if raw_movement_direction.distance_to(Vector2::zero()) > game_core.player.size.y / 2.0
         && !game_core.player.is_stunned()
     {