fixing fire alarm icon when alarm is pulled.
Modifying fire alarm sprites to fix some inconsistencies.
Fixes security level light on fire alarm to be off when alarm is off/broken/missing components.
Fire alarms in the same area now all blink red if the alarm in the area is activated, not just the specific alarm who was activated.
Disassembling a broken fire alarm doesn't drop a circuit now, you "remove the destroyed circuit."
Reducing the number of icons used, using overlays for all fire alarm lights.
one too many update_icon()
Merge pull request #4948 from phil235/FireAlarmFix

Fire alarm fixes