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.

include/wx/generic/datectrl.h

@@ -88,7 +88,7 @@ private:
     wxComboCtrl* m_combo;
     wxCalendarComboPopup* m_popup;
 
-    DECLARE_EVENT_TABLE()
+    wxDECLARE_EVENT_TABLE();
     wxDECLARE_NO_COPY_CLASS(wxDatePickerCtrlGeneric);
 };