New building materials out on unstable branch

Patch notes for Beta 1.4.13

Changes

New materials added for buildings and most of the old ones have been overhauled
Building material system has been overhauled such that you can map 2 colors instead of just 1 and a metallic channel has been added
Added a simple skybox for reflections, even if SSR is disabled, so metallic materials still look decent
Hub caps are now varied across cars and randomized
New surveillance desk 3D model dropped
Made security's reaction to catching burglars red-handed a little more convincing

Fixes

Fixed grid missing in furniture editor
Fixed founders overlapping other UI elements in character menu if UI scaling is used on smaller screen resolutions
Fixed UI sometimes breaking after loading a game if pixel perfect UI was disabled
Fixed skyscraper window rendering being broken for like 3 years
Fixed sky not rendering as a gradient using OpenGL
Fixed wall drag tool not properly checking whether rooms are supported after change in some cases