Furnace b3

Changes:
- Complete rework of the platform near and under point
- Reduced the height of the bridge and connecting geometry
- Added walls that block off vision of the bridge side spawn doors
- Reworked the spawn so that player spawn an even distance from either door
- Changed the size of the door opening trigger to make it harder to spam from spawn
- Moved the resupply cabinet further away from spawn doors making it more difficult to spam from inside spawn
- Added new lighting to brighten up dark spots
- Extended the height of the skybox and the surrounding walls so rocket jumping is easier

Changes:
- Adjusted the height of the platform under the point to be lower
- Removed the triggers inside of the health pack rooms so they won't close after entering them once
- Removed the wall blocking vision from the point on either sides upper spawn door
- Changed the position of the ramps leading down from the upper spawn doors
- Added a bridge connecting the two upper spawn doors
- Widened the map, which includes spawn rooms and the upper spawn doors