FRAG-12 + admins.txt

+ FRAG-12 shotgun shells, created from the unloaded technological
shotshell
+ Adding myself to admins.txt
Movin' house

Moved /obj/item/projectile/bullet/frag12 from
code\modules\projectiles\projectile\bullets.dm to
code\modules\projectiles\projectile\special.dm
Description update

Changed the description of the FRAG-12.
The changeloggening

Added changelog file for the FRAG-12.
The changeloggening 2: Electric boogaloo

Fixed the changelog
Merge pull request #6300 from Thunder12345/grenade_slugs

Adds a new FRAG-12 explosive shotgun shell