Add rack for Depth Charge Shell

[JeroonBosch]

Discussed in #7461

^{Originally posted by MaaiG November 23, 2021}
Depth charges rolling on the your floor?
They’ll think we’re crazy.
P.S. Dear developers! Please resolve this!

Update:
v0.18.11.0

• Depth charges can be stored in coilgun ammo shelves.

[ubertpendragon]

They don't fit