FMath::Clamp clamps a value to be within a given allowed range.
Values outside of that range are set to the closest bound on the allowed range.
GetRangePct is an inverse lerp. Given a range and a value within that range it returns a [0.0 ... 1.0] value describing where in the range the value is. If the value is outside the range then a value less than 0.0 or greater than 1.0 is returned.