More Release updates, as promised

The intended narrative flavouring of the Release feature was that the released chickens were off somewhere, travelling the world, but it appears (from discussion) like previous UI choices made it seem like they had died. I've made some changes to make the intent clearer!

• Released chickens now show in offspring lists as a bindle icon, so it looks less like a chicken died
• The release screen has been spruced up with an image of the chicken carrying their luggage. (I do want to note that they will lose all their accessories and filters in this image, as those are returned to your inventory.)
• For chickens who have been released after the genotype archival update, you can also view their travelling image anytime (via clickable links under their parents' profiles and in family trees). Example Note that this image is generated on demand and is only kept on the server for up to an hour, so hotlinks won't work for long. (This is so free chicken images are taking up less space on the server minute to minute)

In other news...

• Coop expansion prices have been lowered to 700 each! Everyone who has already bought expansions would have received a refund on the difference.