Prize A3b

After a long hiatus, I'm hoping to finish this project off.

Visuals:
- Updated visuals around the capture-zone.
- Updated architecture to reflect the theme.

Game-play:
- Minor layout tweaks to the main pathways

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Changelog for koth_prize
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Alpha 2.1 (2a) changes:
- Extended the roof over the main point.
- Raised some cover either side of the main point to reduce sniper coverage of the catwalk.
- Adjusted fog levels.

Alpha 2.0 changes:
- Added an additional exit to both spawn rooms.
- Raised the height of the second courtyard
- Added additional cover above the point to reduce the effectiveness of rockets and grenades.
- Reduced the size of the main arena.
- Changed the medium health-kits near the points to small health-kits
- Reduced the brightness of the light_environment entity.
- Reworked the path from spawn to the upper catwalk.

Special thanks to:
- "GigglingGem" for the initial feedback on TF2Maps.net
- "Tell Him I Said" for gathering some peeps for a playtest session