Add new assets and implement minimap functionality

- Added new image assets for game over screens: `game_over_dead_bg.png`, `game_over_victory_bg.png`, and their respective Aseprite files.
- Introduced a new `Minimap` class to manage torch placement and rendering on the minimap.
- Implemented methods for adding and removing torches, updating the grid area, and drawing the minimap based on the current state of the game.
- Enhanced the minimap display with color coding for walls, empty spaces, and torches.

game/props/torch.rb

@@ -6,4 +6,13 @@ class Torch < Prop
   def resources
     { wood: rand(0..8) }
   end
+
+  def update(dt)
+    dead = super(dt)
+    if dead
+      $bus.emit(:torch_removed, @x, @y)
+      pp "Emitted torch_removed for torch at #{@x}, #{@y}"
+    end
+    dead
+  end
 end