Implement the blinking lights at a unit level

[Garanas]

Description

Adds the implementation for blinking lights at a unit level. It is not quite perfect:

• Structures that are at an angle will have lights that clip
• Generally, blinking lights at with a Y offset of 0 clip with the terrain

These issues already existed however, and I'll fix those separately.

Testing done on the proposed changes

Started a scenario and spawn in relevant units (factories, storages, radars or sonars) and observe the effects.