Removing Armourer's as a build requirement

[Kaidonni]

I've decided that the Metalsmith (still need to rename) will be built at Fort level, and combines with the Horse Breeders for cavalry units. The Metalsmith's Workshop and above are available at the Castle, Citadel and Fortress, respectively. I felt needing the workshop for Royal Knights, etc, and numerous cavalry units at Keep level was a bit much, and decided to keep them relying only on the the first level building there. But the more advanced ones are still needed for the units that require more to be built, like the Feudal Knights. I just figured that I'd end up over-thinking the whole situation. Metalsmith deals with Fort and Keep units, Workshop deals with Castle units, Guild with Citadel units, Master with Fortress. Didn't want to spend forever racking my brain with thinking what the metalsmith requirements for units should be...could get overly complicated fast.

I'll keep the valour bonuses in, and will look into using Cathedral income for all of those buildings. That said, limiting the Armourer and Metalsmiths to the highest any particular faction requires seems awfully silly...unless the income isn't a great deal, so...