Planet Unknown Inserts

This replaces the 2 plastic inserts that come with the game. They are shorter than the originals too (24mm vs 32mm) so the top of the box gets a bit closer to being able to close properly. The bottom plastic insert that comes with the game should be removed along with the 2 lidded inserts. If anyone wants a part to be designed to hold the thick tracker pieces in place let me know. I don't see the need for one though.

- I made 3 pieces to hold the biomass and asteroids so that they can all easily be in reach of everyone
- For the civ card holders, there is a top section to hold the cards that are active and a bottom section to hold the cards that aren't used
- There are variants for both card holders for sleeved cards

For anyone interested in the lazy susan visible in the first pic, I'll upload that once I'm happy with the design. I made some stupid mistakes on the first designed and haven't had the initiative to go fix it yet.