Update scaleLinear to better handle wrap around cases

In particular, when there is a negative slope near wrap around values, we handle that case better. For example, using `uint32_t` for the input domain, and `uint8_t` for the output range, with the full spectrum of `uint8_t` values used for the output, there can be wrap around to the promoted type of `uint32_t`, which caused problems with the previous calculation.

NAS2D/Math/MathUtils.h

@@ -48,7 +48,10 @@ namespace NAS2D
 	template <typename InputType, typename OutputType>
 	OutputType scaleLinear(const InputType& value, const InputType& domainPoint1, const InputType& domainPoint2, const OutputType& rangePoint1, const OutputType& rangePoint2)
 	{
-		return (value - domainPoint1) * (rangePoint2 - rangePoint1) / (domainPoint2 - domainPoint1) + rangePoint1;
+		const auto domainWidth = domainPoint2 - domainPoint1;
+		const auto distance1 = value - domainPoint1;
+		const auto distance2 = domainPoint2 - value;
+		return (distance1 * rangePoint2 + distance2 * rangePoint1) / domainWidth;
 	}
 
 } // namespace NAS2D