move event files to yoga/events folder

Summary: Moved events files to yoga/events for better code structure

Reviewed By: davidaurelio

Differential Revision: D15198566

fbshipit-source-id: 74d451011841d59fae5a1c637f9c33a7d2d1f87e

yoga/Yoga.cpp

@@ -13,7 +13,7 @@
 #include "YGNode.h"
 #include "YGNodePrint.h"
 #include "Yoga-internal.h"
-#include "events.h"
+#include "event/event.h"
 #include "instrumentation.h"
 #ifdef _MSC_VER
 #include <float.h>

yoga/event/event.cpp

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the LICENSE
  * file in the root directory of this source tree.
  */
-#include "events.h"
+#include "event.h"
 #include <memory>
 #include <stdexcept>