[Gameplay A24] - Tweak Fortress cost and Health.
- 10% Lower build time.
- Cost changed from stonly [sic] to stone and wood.
- Reduced Health by 10%.
- Removed resistance addition.
- Equalised the Iberian fortress since there is no historical justification.
Patch by: @Nescio
Differential revision: D3324
Reviewed by: @borg-
Comment by: @Stan