Synchronicity a3

Update title refers to both the unexpectedness of me continuing this map, and a decent chunk of the patch notes.

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- Switched the gamemode to Arena mode. This is a pretty shoddy attempt to fix some issues with the map, I'll admit that.
- Shrunk most healthpacks around the map to accomodate the new gamemode
- Reworked some of the geometry leading up to the point
- Re-enabled the collision on the fences on the path closest to the point
- Removed the powerstations behind the path closest to the point, because they didn't make thematic sense
- Tightened up the skybox again
- Removed most of the security tape around the map
- Whitened up the env_lighting

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I think I'm going to drastically change the layout next version. I was thinking shortening it up, maybe making it one of those neat 90-degree maps. What do you guys think?

I named the capture point "Gordon Sumner" as a joke because "The Police", who's lead singer was Gordon "Sting" Sumner, wrote two songs named "Synchronicity". Now you know.
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- Changed the window dropdowns in the middle building into doors to improve flow
- Added more signs
- Added a proper skybox (since it was just a cordon cube earlier)
- Added observer points
- Added more pickups
- Fixed the broken door in RED spawn
- Added an Easter egg. Will be removed the version following it's discovery.
- Added a set of stairs to the metal overhangs leading to the mid building
- Re-textured an un-openable metal door so it'd look less like it could be opened.
- Shortened the "Overlook" room behind the capture point.
- Other changes.