Adds 21 new crates and a tweak

http://baystation12.net/forums/viewtopic.php?f=5&t=10297
Fixes and a suggested change

Fixed N2O typo, Super Pacman, anchor issues, inflatable barrier issues
that was already on master so this doesn't conflict, and added a new box
for shotgun shells and adjusted price of crates accordingly
Merge pull request #5024 from Jarcolr/Cargo

Adds 21 new crates and a tweak