Achievements + Preview splicer outcomes

Thanks for your patience around the site's brief downtime. This evening, I pushed out two pretty major changes: Added achievements, and added live previews of splicer and modulator effects in the "Use" panel (thanks @phytodragon for the suggestion!) Some achievements have been issued based on the current state of each user's coop, and more may be added later.

Quick explainer about the downtime: To make the achievements work, I had to completely rework how filters are stored in the backend (I know, it doesn't sound related, but it is). Migrating the database...did not go the way it did in my dev environment, and I had to fix a few entries in the DB by hand.

It should all run smoothly now; the back-end should structure all future database entries correctly. But if you're noticing anything weird with your chickens' filters (and very importantly, if any of your filters don't reappear in your inventory after you remove them from your chicken), please send a bug report and I will make sure you get the item back.

This change might have introduced new bugs, but it should be the last big thing I do before the open beta launch!