Remove conditional compilation.

Runtime/SplineImporter.cs

@@ -1,5 +1,3 @@
-#if UNITY_EDITOR
-
 using System;
 using UnityEditor;
 using UnityEngine;
@@ -189,6 +187,4 @@ namespace FrameJosh.SplineImporter
 
         public Spline[] splines = new Spline[0];
     }
-
-#endif
-}
+}