Downgraded ammunition locker to a regular closet

The armory doesn't need two secure lockers, and certainly not one just to hold beanbag shells.
New sound for more distressing minor announcements

- Plays every time the alert level rises, or emergency access is enabled
- Delayed the start of Intercept.ogg a bit so it doesn't overlap with the alert level sound
Merge branch 'master' of https://github.com/tgstation/-tg-station into ammunitionlocker

Conflicts:
	_maps/map_files/tgstation.2.1.3.dmm
Merge pull request #4934 from Ikarrus/ammunitionlocker

Downgraded ammunition locker to a regular closet
Merge pull request #4935 from Ikarrus/distressing_alert

New sound for more distressing minor announcements
Adding changelog and correcting a typo
Merge branch 'master' of https://github.com/tgstation/-tg-station into CloneMessages