Jarcast's The Etruscans for VP 4

Changelog:
- now both internal and international trade routes yield Artist and Merchant points, amount of points was nerfed from 2/5 to 3/10 of Trade Route Gold.
- normal Internal Trade routes are disabled, that means replacing Granary, Stone Works, and Workshop (that's why they appear among unique components).
- Internal Trade routes yield Food and Production equal to 1.5x the Gold of the trade route.

Changelog:
- Nave UU is now Galley class (obsoletes at Chivalry).

(ﾉ `Д´)ﾉ ︵ ┻━┻

Changelog:

• fixed missing PurchaseCooldown, GlobalFaithPurchaseCooldown for Zilath
• Nave UU now correctly obsoletes at ObsoleteTech of its upgrade unit instead of its PrereqTech
• code cleaning

Fixed a bug which caused the music not to continue after the end of the peace theme.

Thanks again to gwennog for helping me debugging and saving my time for it.

Changelog:

• added beautiful custom promotion icons by gwennog
• fixed bug whereby inland cities adjacent to lake count as coastal and won't be paired to cities with an Epineion
• some text and code cleaning

Changelog:

• Thyrrenian Piracy promo now persists when upgrading the Nave
• fixed coastal-inland pairing not happening when constructing a building giving a free Lighthouse in city (i.e. Great Lighthouse wonder)
• other fixes

Thanks to Gwennog for pointing out the bugs.

Changelog:

• UU Zilath: fixed bug for foreign Trade Mission being unavailable and domestic trade mission giving no Gold.
• UA: raised Great people points from trade routes from 1/3 to 2/5 of TR Gold yield
• UA: internal trade routes yielding Gold now provide also 1/4 of Gold as Food and Production in the destination City (not shown in trade route UI but in side notification).
• UU Zilath: Gold for domestic mission now equal to 1/2 of foreign one (before it was 2/3) but now gives also Culture equal to 1/10 of foreign trade mission Gold.