End Era As You Like

Adds a project to your city hall that allows you to end the era when the project finishes, costs 1 production. Works across all eras. However era will still progress from researching future tech/civic and when other players completes milestones, so Id recommend you to pair this mod with teeaa's No age progress from events & dunkleosteus's No Age Progress from Future Tech and Future Civic . This way you have more control over when do you want to end the era. I'm still trying to figure out how to link modifiers to allow project so if you know how to do that please let me know.