Added DVec3::Set (#937)

Jolt/Math/DVec3.h

@@ -154,6 +154,9 @@ public:
 	JPH_INLINE void				SetY(double inY)								{ mF64[1] = inY; }
 	JPH_INLINE void				SetZ(double inZ)								{ mF64[2] = mF64[3] = inZ; } // Assure Z and W are the same
 
+	/// Set all components
+	JPH_INLINE void				Set(double inX, double inY, double inZ)			{ *this = DVec3(inX, inY, inZ); }
+
 	/// Get double component by index
 	JPH_INLINE double			operator [] (uint inCoordinate) const			{ JPH_ASSERT(inCoordinate < 3); return mF64[inCoordinate]; }