Assorted minor cleanup (and shotgun shell descriptions) in Resources\Prototypes\Entit...

Assorted minor cleanup (and shotgun shell descriptions) in Resources\Prototypes\Entities\Objects\Weapons\Guns\Ammunition\ (#41841)

* YAML cleanup of shotgun rounds

* Descriptions for all shotgun ammo types

* YAML cleanup of pistol rounds

* YAML cleanup of magnum rounds (and tweaks to uranium ammo descriptions)

* YAML cleanup of rifle rounds

* YAML cleanup of toy rounds

* YAML cleanup of magnum/pistol/rifle/shotgun projectiles

* YAML cleanup of magnum/pistol/toy speedloaders

* YAML cleanup of light rifle rounds

* Descriptions for anti-materiel rounds and boxes

* YAML cleanup of base_cartridge.yml

* YAML cleanup of caseless rounds (plus minor viper-mag description tweaks)

* YAML cleanup of heavy rifle rounds

* YAML cleanup of grenades and explosives

* machine pistol magazine is now Security contraband

* Practice ammunition description updates

* Missed a magnum ammo description tweak

* Whoops, misspelled the word 'description' a lot

* Practice ammunition description updates 2!

* Better name/description for joke L6 foam dart mag

* Tweak to that last commit

* Fixed practice machine pistol magazines using real bullets