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.

tests/geometry/rect.cpp

@@ -57,7 +57,7 @@ private:
     void Operators();
     void Union();
 
-    DECLARE_NO_COPY_CLASS(RectTestCase)
+    wxDECLARE_NO_COPY_CLASS(RectTestCase);
 };
 
 // register in the unnamed registry so that these tests are run by default