Introduce new gradient generator for softer/smoother results
Before: https://files.facepunch.com/ognik/1b3011b1/2021-12-19_27-54-bd323c25-6f85-48ec-96a8-35595829d12c-HvsjGFLB.png
After: https://files.facepunch.com/ognik/1b3011b1/2021-12-19_26-43-0861d68b-f9b6-46f5-bd46-33e91fe7e2f4-V5x7aG7c.png