Randomgen A3

Nicer sky, there are now segments beneath the Control Point which means there could be a route underneath (there's a small health kit there too!) and soundscapes for some reason

A lot of changes I'm cramming in before it gets playtested!

• Added cinematic "scramble" effect showing the segments randomizing. There's also a new window in the spawnrooms to see it from!
  
• Added second level of random segments for more height variation
• Segments towards the front are ramps instead of blocks to reduce situations where certain classes may be unable to advance
• Segments at mid have been removed temporarily while I work around Hammer messing up paste special

To do:

• More segment types
• Oh yeah... Stickies slide off of func_brushes... oops.
  
• I'm having trouble with making empty segments because of asterixis
• Other stuff