[FEATURE] Custom Admin-spawnable banana grenade variants

[Noah Buttes]

Gives admins a special verb to create a grenade that will spit out five copies of a specific object. Works with just about anything, from plasma glass to y-drone spawners.

Comparison:
https://github.com/goonstation/goonstati...ttes:admin

Patch:
https://github.com/goonstation/goonstati...dmin.patch

Known compatibility issues:
None

Demonstration of the possibilities: