Move core/include/fxcrt to core/fxcrt/include.

This CL moves the fxcrt code into the core/fxcrt directory. The only exception
was fx_bidi.h which was moved into core/fxcrt as it is not used outside of
core/.

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1825953002 .
diff --git a/fpdfsdk/javascript/JS_EventHandler.h b/fpdfsdk/javascript/JS_EventHandler.h
index 5a81974..41d3705 100644
--- a/fpdfsdk/javascript/JS_EventHandler.h
+++ b/fpdfsdk/javascript/JS_EventHandler.h
@@ -7,8 +7,8 @@
 #ifndef FPDFSDK_JAVASCRIPT_JS_EVENTHANDLER_H_
 #define FPDFSDK_JAVASCRIPT_JS_EVENTHANDLER_H_
 
-#include "core/include/fxcrt/fx_string.h"
-#include "core/include/fxcrt/fx_system.h"
+#include "core/fxcrt/include/fx_string.h"
+#include "core/fxcrt/include/fx_system.h"
 
 class CJS_Context;
 class CPDFSDK_Annot;