Sukritact's Aksum Rework

I haven't done a proper play-through yet so there may be bugs! Changelog: Tier 2 of Periplus of the Erythraean Sea is buffed to: +3 Gold on Quarters on or adjacent to Coast. The Port of Nations Tradition now scales per Age: +2 Culture and Gold per Age for every active Trade Route. The Throne of My Fathers Tradition grants the following ability instead: +1 Resource Capacity per Wonder. The May this Please the People Tradition grants the following ability instead: +15% Gold in Cities adjacent to Coast. This isn't part of the Aksum Civ per se, but Great Stele now states that it scales per age: Gain 200 Gold per Age when you construct a Wonder in this Settlement, including this one. Ageless. Must be placed on Flat Terrain. It actually already did this, but this wasn't mentioned in the description.