Menhir A2b

Alpha 2b changes:
- Changed the skybox and lighting based on feedback.
- Readded a wall to block a ludicrous sightline. (will probably keep adjusting)
- Moved and added health kits to make them easier to find.
- Replaced ladders with ramps because of feddback.​

Alpha 2 changes:
- Changed the skybox to one that fits my idea of the map's theme better.
- Tweaked layout to add more paths to the point.
- Based on feedback, made the map bigger, removed a wall and a door, and moved a health pack.
- Added more cover (and a little shack/house/hut).​