[Gameplay A24] - Adjust some siege engine stats.
- Changes footprints to better match their visuals.
- Lowers ram cost to compensate for ther reduced effectiveness (against units).
- Loot = 20% cost.
- Change experience loot to relate to health.
- Give Kush ram +2 garrison capacity and +20 attack damage since it is the same actor as the Persian ram.
- Adjust fireraiser template.