Frequency A3B

- Fixed missing textures and models

I chose a different, "faster" compile method to make the last hotfix update. I failed to realize that it didn't pack the models/textures

- Fixed broken respawn visualizers on RED's side

- Reworked much of the layout
- Added a drop-down from the high ground to the sewers
- Added a new skybox, sky_soft, from the Autumnal Content Pack by @Berry

Mid still remains largely untouched, which is fine for now. I planned to fix more problems with the map, but I also wanted to push out an update before I went off to Uni, which is in a few days. The new layout is a little flatter than I'd like, but it might not be as bad as I'm thinking.

- Switched out the HL2 skybox for a TF2 one
- Changed the world lighting
- Adjusted the interior lighting
- Made the "sewer" behind mid more sewer-like (lower and lightly flooded)
- Fixed BLU's backward door frames in the brick building
- Made the crates blocking the door frames of the brick buildings half-crates
- Increased the height of the brick building Sniper windows by 16hu
- Made the brick building sniper rooms smaller, from 340hu to 192hu
- Removed the jump pads, as during development they stopped working as intended
- Added some signs around spawns
- Moved spawn to the large building in front of it
- Other various changes

Not too happy with the current layout in some spots, namely with the brick building and around the point. It'll take me a bit longer to push out A3 because I want to take my time making these reworks as good as they can be.