Gloomhaven Insert (based on Monster All In One Containers)

This is an insert for Gloomhaven. It's based on the excellent [Monster All In One Containers by YY-Guys](https://www.thingiverse.com/thing:2797796) (and the [corresponding remix adding labels by jgrg1](https://www.thingiverse.com/thing:3013163)). Please start there and see if you're willing to put in the time and filament needed to print everything out.

After printing a complete set of the monster containers linked above, I realized I didn't have a good way to store them. Things quickly got o