List of things that should have emissive overlays

Describe the feature request

Emissive overlays can be added by overriding update_overlays and adding emissive appearances.

Emissives work similar to lighting, if you have a fully red pixel then there will be red light added to the tile. This means that any red items on the tile will display, but if there is no other light then the green and blue will not be visible, similar to how if you are in a room with red lighting in real life then any cyan coloured objects will look black because they aren't reflecting any red light.

Here are some things that would look nice with emissives appearances:

• Requests console
• Intercoms
• Air alarms
• Vending machines (TG has one for these)
• The light on cameras
• The PDA screen/light when turned on
• Holopads when emitting stuff (Would be super cool but might be basically impossible due to being underneath stuff as everything would have to be emissive blocking unless we can find a way to make it look fine without emissive blocking)
• IPC screens (may be harder as it has to account for them wearing masks, so worn masks would have to be emissive blocking, see ethereals as they have a glowing effect)
• Suit storage units
• Lights on airlocks when opened and bolted/emergency access (This would have a good impact due to maintenance being dark mostly)
• Clothes such as the helmet light on syndicate hardsuits
• Hud glasses/night vision goggles could have a very slight low alpha glow to them to represent that they are emitting light but that light is hard to see
• Energy weapons