Use wx-prefixed macros throughout the repository.

Change {DECLARE,IMPLEMENT}_*CLASS and {DECLARE,BEGIN,END}_EVENT_TABLE
occurrences to use the wx-prefixed version of the macros.

samples/sashtest/sashtest.h

@@ -47,7 +47,7 @@ protected:
     wxSashLayoutWindow* m_leftWindow2;
     wxSashLayoutWindow* m_bottomWindow;
 
-DECLARE_EVENT_TABLE()
+    wxDECLARE_EVENT_TABLE();
 };
 
 class MyChild: public wxMDIChildFrame
@@ -59,7 +59,7 @@ class MyChild: public wxMDIChildFrame
     void OnActivate(wxActivateEvent& event);
     void OnQuit(wxCommandEvent& event);
 
-DECLARE_EVENT_TABLE()
+    wxDECLARE_EVENT_TABLE();
 };
 
 #define SASHTEST_QUIT        wxID_EXIT