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.

utils/screenshotgen/src/customcombo.h

@@ -117,7 +117,7 @@ protected:
     int             m_itemHere;     // hot item in popup
 
 private:
-    DECLARE_EVENT_TABLE()
+    wxDECLARE_EVENT_TABLE();
 };
 
 
@@ -241,7 +241,7 @@ protected:
     wxTreeItemId        m_itemHere;     // hot item in popup
 
 private:
-    DECLARE_EVENT_TABLE()
+    wxDECLARE_EVENT_TABLE();
 };