Re-evaluate orcish building requirements

[pjf]

• [x] All industry requires iron, steel or rusty versions thereof (14205cf)
• [x] All buildings use architecture exclusively (bfbec2a5b7475de77324e0098d501a1ce57c9b78)
• [x] All other buildings need to be examined
• [ ] Building requirements should be documented in the orc manual

Honour building requirements:

• Caravanserai require 1 standard of honour
• The Meadhall requires 4
• Caravanserai blueprints are gone.

If we need to rebalance how hard things are in general, that will be done by changing how many scalps are needed for a single banner.

Milestone 2 will implement new buildings that require not only standards of honour, but potentially standards from a particular race.

[pjf]

moseythepirate makes a good point in the forums that 'ironbone' represents the old ways, and iron represents the new. Consequently, it's more thematic for the blacksmoke furnace to use iron in its construction. (Unfortunately, that still leaves us with our bottleneck)

[pjf]

Meph points out we could just add a reaction class, and use that. This makes a lot of sense. [ORC_INDUSTRY_METAL] could be rusty iron, iron, rusty steel, or regular steel.

[pjf]

With Orichalcum rebalanced, all caravanserai require a single standard of honour.