Leugi's Crisis Pacing Rework

Crises... we all have them! Who needs them? They're just like us... This mod changes the pacing of crises, making them start earlier. BUT WHY? DON'T YOU HATE CRISES? .... I kinda do but the attempt here is to make them feel less like a sudden "everything went bad out of nowhere" thing and more like something that starts boiling up around the middle of the age and grows slowly until it reaches its climax; hopefully making it feel more immersive. Interestingly, this mod actually started as a "shorter Crises" mod, but after playing I felt that making Crises shorter didn't actually help at all to immersion so I instead pivoted to the opposite. After playing around with different varitions, it does seem this setup helps make crises feel less sudden and immersion-breaking. Most importantly, since the weakest stage of the crisis lasts longer, it gives you enough time to alter your strategy and prepare for new stages if it is a crisis that is particularly dangerous for your current playthrough. The new thresholds go as follow: Stage 1: Crisis starts at around 50% of the age. Stage 2: the Crisis worsens at around 65% of the age. Stage 3: the Crisis reaches its climax at around 85% of the age. As you can see, the crisis starts around half of the age, allowing it to scale more slowly. The largest stage is the middle stage where there's already some interesting mechanics but it is still not awful, and the final bit reaches on when you are already used to it all, giving a final boss feeli