Remove default arguments from math::rescale() since it's non-obvious whether they should apply to the input or output scale.

include/math.hpp

@@ -148,7 +148,7 @@ inline float chop(float x, float epsilon = 1e-6f) {
 
 /** Rescales `x` from the range `[xMin, xMax]` to `[yMin, yMax]`.
 */
-inline float rescale(float x, float xMin, float xMax, float yMin = 0.f, float yMax = 1.f) {
+inline float rescale(float x, float xMin, float xMax, float yMin, float yMax) {
 	return yMin + (x - xMin) / (xMax - xMin) * (yMax - yMin);
 }