spawn/mech-basic.xml : SPAWN_ROBOT/SPAWN_ROBOT_BASIC
spawn/mech-fire.xml	: SPAWN_ROBOT/SPAWN_ROBOT_FLAMETHROWER
spawn/mech-guns.xml	: SPAWN_ROBOT/SPAWN_ROBOT_ARMED
spawn/mech-rockets.xml : SPAWN_ROBOT/SPAWN_ROBOT_ROCKET_LAUNCHER