Catan replacement pieces

A friend needed some pieces for Settlers of Catan for the various expansions and I found that there were quite a few that weren't available on Thingiverse, so I took to Fusion360 and made what I needed. It's not completely comprehensive, but with these models and [these other models](https://www.thingiverse.com/thing:2777400) you should be able to find all the spare/replacement parts you need.

You'll find pieces for the standard game, cities & knights, and explorers & pirates expansions. I also designed knight pieces that can be flipped to show when they're active (painting the triangle on the active side would probably also help to distinguish active from inactive).