Burst fire for automatic weapons
Fixes a couple missing var settings
Adds select fire for burst fire weapons
Merge branch 'master' of https://github.com/tgstation/-tg-station into burtsfiya

Conflicts:
	code/modules/projectiles/gun.dm
	code/modules/projectiles/guns/projectile/automatic.dm
	code/modules/projectiles/guns/projectile/shotgun.dm
	icons/obj/gun.dmi
Merge pull request #6356 from paprka/burtsfiya

Burst fire for some projectile weapons