Removed legacy/unused IEventLoopHook

Signed-off-by: Chris Galvan <chgalvan@amazon.com>

Code/Editor/Include/IEventLoopHook.h

@@ -1,24 +0,0 @@
-/*
- * Copyright (c) Contributors to the Open 3D Engine Project.
- * For complete copyright and license terms please see the LICENSE at the root of this distribution.
- *
- * SPDX-License-Identifier: Apache-2.0 OR MIT
- *
- */
-
-
-#ifndef CRYINCLUDE_EDITOR_INCLUDE_IEVENTLOOPHOOK_H
-#define CRYINCLUDE_EDITOR_INCLUDE_IEVENTLOOPHOOK_H
-#pragma once
-
-struct IEventLoopHook
-{
-    IEventLoopHook* pNextHook;
-
-    IEventLoopHook()
-        : pNextHook(0) {}
-
-    virtual bool PrePumpMessage() { return false; }
-};
-
-#endif // CRYINCLUDE_EDITOR_INCLUDE_IEVENTLOOPHOOK_H