Add fire and smoke related classes

[connorjcantrell]

Fire, Smoke, Combination Fire Smoke, Corridor, and Ceiling Dampers: There are 5 types of fire life safety dampers according to UL (UL sets safety standards for fire and smoke dampers.) - source

Duct Smoke Detector: Duct smoke detectors sample currents in the air handling equipment to determine if smoke or fumes are present. If smoke is detected, the device will close dampers and stop fans. - example

Smoke Zone: The fire alarm zones are the zones on the fire alarm panel used to help staff identify the location of the fire. These are different from smoke zones, which are the zones in the building created to prevent the spread of smoke and fire and allow staff time to complete a full evacuation of the building. - source

Also added fire hydrant, fire extinguisher, and exit sign.

[gtfierro]

These look good to me. @ektrah would you be able to check this when you get a chance and let me know if you are ok with these fire concepts?