Update content to remove redundant Robust math types (#38930)

Vector3, Vector4, Matrix4, and Quaternion are now gone. This switches us over to System.Numerics where applicable.

Content.Client/Light/RgbLightControllerSystem.cs

@@ -1,4 +1,5 @@
 using System.Linq;
+using System.Numerics;
 using Content.Client.Items.Systems;
 using Content.Shared.Clothing;
 using Content.Shared.Hands;