Ampage a2

- Fixed the awful audio-breaking bridge opening sound
- Fixed map lighting and fog back to normal
- Adjusted playerclips in BLU spawnroom
- Added nobuild in BLU spawnroom
- Added basic areaportals for optimisation
- Given RED and BLU some more height variation throughout the map
- Added a simple message at the start of the map to indicate that this is Stage 1 of 3
- Waterwheel still doesn't turn yet