[Beta] Custom Research API

Summary: This mod will not add any additional research to the vanilla game by itself. It upgrades the great library interface and adds an API to help modders easily add custom research. Games that were saved with custom research still work perfectly after the mod is removed. Any custom research they have unlocked will still be unlocked if the custom research mod is added again. How to use Custom Research API in your mod: Download THESE shared files and include them in your project. You will also need to include them in your mod release. Make sure to include this mod as a dependency. HERE is a simple, well commented example showing how to register custom research and how to activate your effect. Contact: Feel free to reach out to me on the official Kingdoms and Castles discord as @Phedg1