Moved Testing function to Tools/mathx menu item, and added documentation

Author: ltmx

Runtime/mathx.common.int.cs

@@ -172,7 +172,7 @@ public static partial class mathx
         /// <inheritdoc cref="pow(int4,int4)"/>
         [MethodImpl(IL)] public static float2 pow(this int2 f, int2 y) => math.pow(f, y);
         /// <inheritdoc cref="pow(int4,int4)"/>
-        [MethodImpl(IL)] public static float pow(this int f, int y) => math.pow(f, y);
+        [MethodImpl(IL)] public static float pow(this int f, int y) => math.pow(f, y); // has to return float in case there are negative input values
 
         /// <inheritdoc cref="pow(int4,int4)"/>
         [MethodImpl(IL)] public static float4 pow(this int4 f, int pow) => new(math.pow(f.x, pow), math.pow(f.y, pow), math.pow(f.z, pow), math.pow(f.w, pow));

TestMe.cs

@@ -18,7 +18,7 @@ namespace Unity.Mathematics
 {
     public static partial class mathx
     {
-        [MenuItem("Athena/Test")]
+        [MenuItem("Tools/mathx/Test")]
         public static void TestBenchmark()
         {
             var d = 2.3;