[Version3.2.4] Building Props / Random image background from Unsplash

[Version3.2.4]

Building Props

I added Props about the building.

Since presets for props can cause app size bloat, I only added low-poly ones this time.

In the future, I plan to add DLC to expand presets by theme, such as schools and offices.

Random image background from Unsplash

I implemented a function to get a random image from Unsplash and set it as the background image.