Create directional helpers for air alarms.

[warriorstar-orion]

What Does This PR Do

This PR continues the directionalizing of wall bumps, this time for air alarms.

Why It's Good For The Game

Consistency in mapping helpers is good. Map files are smaller with fewer varedits. Use of mapping helpers is enforced with maplint rules.

Images of changes

Check MDB.

Testing

Spawned in, verified positions of air alarms on stations, built air alarms, verified directions of constructed air alarms.

Changelog

NPFC