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.

demos/poem/wxpoem.h

@@ -25,7 +25,7 @@ public:
     int OnExit();
 };
 
-DECLARE_APP(MyApp)
+wxDECLARE_APP(MyApp);
 
 // Define a new canvas which can receive some events
 class MyCanvas: public wxWindow
@@ -41,7 +41,7 @@ public:
 private:
     wxMenu *m_popupMenu;
 
-    DECLARE_EVENT_TABLE()
+    wxDECLARE_EVENT_TABLE();
 };
 
 // Define a new frame
@@ -94,7 +94,7 @@ private:
     // Icons
     wxIcon *m_corners[4];
 
-    DECLARE_EVENT_TABLE()
+    wxDECLARE_EVENT_TABLE();
 };
 
 // Menu items