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.

src/osx/slider_osx.cpp

@@ -15,8 +15,8 @@
 #include "wx/slider.h"
 #include "wx/osx/private.h"
 
-BEGIN_EVENT_TABLE(wxSlider, wxControl)
-END_EVENT_TABLE()
+wxBEGIN_EVENT_TABLE(wxSlider, wxControl)
+wxEND_EVENT_TABLE()
 
  // The dimensions of the different styles of sliders (from Aqua document)
 #if wxOSX_USE_COCOA