Build on r14174 based on discussion on IRC. Allow fortresses, towers, and wall towers to attack siege again, but debonus them 0.5x against it. Bonus catapults 1.25x vs fortresses, but reduce their attack vs buildings slightly in order to make them effective against all buildings but slightly better against fortresses' huge HP. They still have far less DPS than rams, even against fortresses, but are more flexible and are ranged. Enforce a minimum distance of 60 between fortresses, meaning that fewer can fire on siege weapons at once, and turtling is slightly less effective in general. Minor stat changes dealing with range of towers, fortresses, and catapults. Increase catapult splash radius and decrease splash damage, to make catapults more effective as semi-static defense against large numbers of infantry.