Tweaks for visibility checks regarding vehicles and furniture

[Night-Pryanik]

Summary

Bugfixes "Tweaks for visibility checks regarding vehicles and furniture"

Purpose of change

Visibility checks checked only for coverage value of furniture (if any) on a given tile, even if there's a vehicle there. Flowers, being a furniture and having TRANSPARENT flag, gave 0% concealment. So if there's a flower underneath vehicle's closed doors, quarterpanels or other opaque part, you was able to see right through that part.

I'm crouching here to narrow the field of view, in order to make the bug more demonstrative, but you have that visibility even when standing.

Also previous checks considered open doors as non-transparent if you were crouching.

Closes #49381.

Describe the solution

• Reordered checks for visibility. Made game check for vehicles first, and for furniture second.
• Added a check for open doors so they no longer block vision while crouching.

Describe alternatives you've considered

None.

Testing

Get vehicle, spawned dandelion under one of its closed doors. Crouched, checked that dandelion no longer makes me see through the door.
Opened door while crouched, checked that I can see through open door.

Additional context