5.38 Update stuff

[Ealb]

Must-do:

• Update Sidhe to be iron-vulnerable and +1 attack; update fae hobug theme to include iron vulnerability
• Piconye demographic theme for hoburg nations ( ;p )
• Add scimitars, deprecate custom bronze swords and falchions, etc. as a weapon option (deprecate the rarely-used iron kopesh? probably...), add cloth headpieces as an armor id where appropriate, etc
• ... ?

Should do:

• Add iron vulnerability to some filters, either as an offset to make glamour less expensive or as a drawback (note this needs to consider iron v. bronze in the unit's nation)
• Add some troop retinue elite/sacred options like the Nabaean falconers
• Add #domsail as a national domain effect
• Add Nabaean spells to spell lists
• ... ?

Can do:

• Cannibalize Nabaean robes and hats for Avvim
• Cannibalize Indian Cynpcephalian troops
• Mainline Indian troops as the model for Enlightened Humans, though I suppose yaksha-looking size-2 units would still work well as atavi humans
• Add Civilized Humans based primarily on Gath and Na'Ba
• Add a no-scout-but-scrying-site option for nations?
• ... ?