Sigam A3

Fixed the cubemap
Added a new forward spawn for blue
Changed the layout for B

The next update will rework the map itself so it isn't flat

+ New route from A to B
+ New route from Truck Area to B
+ New route from the building after A to the Truck Area

I reworked the inside of B to (hopefully) give Red less of an edge. There's also a few more routes in the map (some open up when A is capped) to allow for flanking