Additions

• Added the ability to apply wallpaper to the areas below stairs

Improvements

• Increase the size of various previews in build mode
• Improved depth calculations for wallpaper and tiles

Fixes

• Fixed wallpaper and tile previews rendering incorrectly in build mode
• Fixed a rare crash when people with map-wide lot employments visit other maps
• Fixed people with lot employments visiting other maps causing them to get stuck
• Fixed a birthday notification being displayed for adults even though they can't age up