move vector3f to core

src/DotRecast.Core/Vector3f.cs

@@ -16,18 +16,14 @@ freely, subject to the following restrictions:
 3. This notice may not be removed or altered from any source distribution.
 */
 
-namespace DotRecast.Detour.Extras
+namespace DotRecast.Core
 {
-    public class Vector3f
+    public struct Vector3f
     {
         public float x { get; set; }
         public float y { get; set; }
         public float z { get; set; }
 
-        public Vector3f()
-        {
-        }
-
         public Vector3f(float x, float y, float z)
         {
             this.x = x;

src/DotRecast.Detour.Extras/Unity/Astar/GraphMeta.cs

@@ -16,6 +16,8 @@ freely, subject to the following restrictions:
 3. This notice may not be removed or altered from any source distribution.
 */
 
+using DotRecast.Core;
+
 namespace DotRecast.Detour.Extras.Unity.Astar
 {
     public class GraphMeta

src/DotRecast.Detour.Extras/Unity/Astar/NodeLink2.cs

@@ -16,6 +16,8 @@ freely, subject to the following restrictions:
 3. This notice may not be removed or altered from any source distribution.
 */
 
+using DotRecast.Core;
+
 namespace DotRecast.Detour.Extras.Unity.Astar
 {
     public class NodeLink2