1830: Railroads and Robber Barons (Avalon Hill 1986) organizer

After using my original 3D-printed tile tray designs for several months, I decided to refactor them and add some features to improve the usability of the boxes:

1. **Rounded boxes** -- All of the boxes now use rounded corners and edges that make them more comfortable to use.
1. **Locking lids** -- All of the boxes now use press-fit lids that are easy to separate, but lock into place, to keep from accidently spilling the tiles.
1. **Redesigned hex boxes** -- The redesigned hex boxes and lids