新增对 InputSystem 的支持

Update BaseGraph.cs

Update XCharts.Runtime.asmdef

Runtime/Component/VisualMap/VisualMapHandler.cs

@@ -3,7 +3,9 @@ using UnityEngine;
 using UnityEngine.EventSystems;
 using UnityEngine.UI;
 using XUGL;
-
+#if INPUT_SYSTEM_ENABLED
+using Input = XCharts.Runtime.InputHelper;
+#endif
 namespace XCharts.Runtime
 {
     [UnityEngine.Scripting.Preserve]