removed unused declarations

Author: StephenHodgson

Assets/MixedRealityToolkit/_Core/Inspectors/Utilities/Lines/DataProviders/ParabolicConstrainedLineDataProviderInspector.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License. See LICENSE in the project root for license information.
 
-using Microsoft.MixedReality.Toolkit.Core.Utilities;
 using Microsoft.MixedReality.Toolkit.Core.Utilities.Lines.DataProviders;
 using UnityEditor;
 using UnityEngine;

Assets/MixedRealityToolkit/_Core/Inspectors/Utilities/Lines/DataProviders/SimpleLineDataProviderInspector.cs

@@ -1,7 +1,6 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License. See LICENSE in the project root for license information.
 
-using Microsoft.MixedReality.Toolkit.Core.Utilities;
 using Microsoft.MixedReality.Toolkit.Core.Utilities.Lines.DataProviders;
 using UnityEditor;
 using UnityEngine;

Assets/MixedRealityToolkit/_Core/Inspectors/Utilities/Lines/DataProviders/SplineDataProviderInspector.cs

@@ -2,7 +2,6 @@
 // Licensed under the MIT License. See LICENSE in the project root for license information.
 
 using Microsoft.MixedReality.Toolkit.Core.Definitions.Utilities;
-using Microsoft.MixedReality.Toolkit.Core.Utilities;
 using Microsoft.MixedReality.Toolkit.Core.Utilities.Lines.DataProviders;
 using System.Collections.Generic;
 using UnityEditor;