Spigot b5

Likely this map's final update, it includes polish for some geometry and visuals. Map does not have 3D skybox but is otherwise finished!

-Major artpass!
-Many new props and small changes to geometry
-Rain and soundscapes

Known issues:
-Optimization (is hard)
-Skybox and out-of-map-details

Many changes based on some very helpful feedback!
-Some reductions to "high ground" height
-More pickups and better pickup locations
-New LoS blockers focused around mid
-New all-class route to access sniper deck
-Better, wider bridges onto control Point
-Changed an annoying crouch jump into simple stairs

Known Bugs:
-One func_respawnroomvisualizer not appearing visually but fully functional
-Some lighting jank (it's alpha, sue me)