Split the common event classes out to files.

xfa/fwl/core/cfwl_event.cpp

Index: xfa/fwl/core/cfwl_event.cpp
diff --git a/xfa/fxfa/parser/cxfa_text.cpp b/xfa/fwl/core/cfwl_event.cpp
similarity index 52%
copy from xfa/fxfa/parser/cxfa_text.cpp
copy to xfa/fwl/core/cfwl_event.cpp
index fc7d7aa280e2900081d2e05d99d1a5e94fd7bd68..06b734531fab7c18d6a2f17f92ece2c3165e3aea 100644
--- a/xfa/fxfa/parser/cxfa_text.cpp
+++ b/xfa/fwl/core/cfwl_event.cpp
@@ -4,12 +4,12 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#include "xfa/fxfa/parser/cxfa_text.h"
+#include "xfa/fwl/core/cfwl_event.h"
 
-#include "xfa/fxfa/parser/xfa_object.h"
+CFWL_Event::CFWL_Event() : m_pSrcTarget(nullptr), m_pDstTarget(nullptr) {}
 
-CXFA_Text::CXFA_Text(CXFA_Node* pNode) : CXFA_Data(pNode) {}
+CFWL_Event::~CFWL_Event() {}
 
-void CXFA_Text::GetContent(CFX_WideString& wsText) {
-  m_pNode->TryContent(wsText);
+CFWL_EventType CFWL_Event::GetClassID() const {
+  return CFWL_EventType::None;
 }