[Gameplay A24] - Enable stable for all civilisations.
Moves cavalry there.
Moves chariots there.
Moves wardogs there.
Makes the unlock_champions tech cheaper because it now only unlocks infantry.
Removed increased cost of cart_temple since the kush one doesn't have that either.
Patch by: @Nescio
Differential revision: D2801
Reviewed by: @borg-, @ValihrAnt
Comments by: @Angen, @badosu, @Feldfeld