adds basic menu functionnality

TileMap.gd

@@ -5,7 +5,10 @@ enum { LEFT, RIGHT, UP, DOWN }
 enum { DOWN_LEFT, DOWN_RIGHT, LEFT_RIGHT, START, UP_DOWN, UP_LEFT, UP_RIGHT }
 
 # Called when the node enters the scene tree for the first time.
-func _ready():
+func _reset():
+	_reload_track()
+
+func _reload_track():
 	_clear_tiles()
 	var track = TrackSelection.get_current_track()
 	for idx in range(track.size()):