Better Civ and Culture Addition

Currently, the only way to truly add a new civilization or culture is through hacking the game. This is time-consuming, difficult, sometimes infuriating, and overall messy. Many times, the workarounds in hacking the game are inefficient and require a great deal of extra work. 

In Retold, it would be extremely helpful if there was a way to simply and directly add a new civ or a new culture, including functionality in:

1. The main god picker menus.
2. The dropdown god picker menus.
3. Techtree, anim, sound, and proto tags.
4. The fake techtree.
5. UI elements such as the game border.