Show what tiles are required to pass the level

[thunderrabbit]

In each level definition, there is a field

required_tiles = {"dog": 5,
         "cow": 5}

In the case above, the level should show the player must collect 5 dog tiles and 5 cow tiles to finish the level.

It can likely be done with a 1x1 "swipe" like those in star_requirements.gd function display_next_requirement

https://github.com/thunderrabbit/conswi/blob/5be1a46d6e0685782772b88555c347aa85c2c2ed/subscenes/StarRequirements.gd#L82

[thunderrabbit]

Let's have a panda bear cow dog monkey sheep pig cat lion rabbit tiger zebra leopard polar snake party!