australium_payload a2a

Gamemode Changes:
- Flag now turns neutral after 5 seconds, and respawns after 15.
- The payload will now detonate and respawn when a push is failed (Flag becomes neutral)
- Alarm sfx changed to the MvM Gate sfx

Layout Changes:
- Revamped the Australium dropsite completely
- Moved the spawn area for both teams further back, and created a new spawn.
- Added a new side-route to the australium dropsite
- Added cubemaps
- Added spectator cam.

there's signs plastered on the walls now telling you where to go, but you can't read and go to the same spot over and over and over to die to the same sniper that's been holding that angle since 2013.

Oh, There's also less window in the window now.

Fixes issue where walking out of spawn would cause with HDR enabled.