Revised terrain and some defensive structures to allow for more manpower and faster victory finishes.

Huge update to visual fidelity and terrain. Some minor balancing issues. Slight adjustments to the central chokepoint.

Terrain adjusted to focus even more clusterf*ck in the center with only one (broad) way to go through and shorter reinforcement paths.

first texture pass, added trees and groves, more bunkers, some chokepoints are more narrow.