Remove Windows CE support

Windows CE doesn't seem to be supported by Microsoft any longer. Last CE
release was in early 2013 and the PocketPC and Smartphone targets supported by
wxWidgets are long gone.

The build files where already removed in an earlier cleanup this commit
removes all files, every #ifdef and all documentation regarding the Windows CE
support.

Closes https://github.com/wxWidgets/wxWidgets/pull/81

include/wx/msw/window.h

@@ -18,11 +18,7 @@
 // resizing complicated window hierarchies, but this can in theory result in
 // different behaviour than the old code so we keep the possibility to use it
 // by setting this to 0 (in the future this should be removed completely)
-#ifdef __WXWINCE__
-    #define wxUSE_DEFERRED_SIZING 0
-#else
-    #define wxUSE_DEFERRED_SIZING 1
-#endif
+#define wxUSE_DEFERRED_SIZING 1
 
 // ---------------------------------------------------------------------------
 // wxWindow declaration for MSW
@@ -139,11 +135,6 @@ public:
     virtual bool UnregisterHotKey(int hotkeyId);
 #endif // wxUSE_HOTKEY
 
-#ifdef __POCKETPC__
-    bool IsContextMenuEnabled() const { return m_contextMenuEnabled; }
-    void EnableContextMenu(bool enable = true) { m_contextMenuEnabled = enable; }
-#endif
-
     // window handle stuff
     // -------------------
 
@@ -188,9 +179,6 @@ public:
     // --------------
 
     void OnPaint(wxPaintEvent& event);
-#ifdef __WXWINCE__
-    void OnInitDialog(wxInitDialogEvent& event);
-#endif
 
 public:
     // Windows subclassing
@@ -486,7 +474,7 @@ public:
         return InheritsBackgroundColour();
     }
 
-#if !defined(__WXWINCE__) && !defined(__WXUNIVERSAL__)
+#if !defined(__WXUNIVERSAL__)
     #define wxHAS_MSW_BACKGROUND_ERASE_HOOK
 #endif
 
@@ -719,10 +707,6 @@ protected:
 #endif // wxUSE_DEFERRED_SIZING
 
 private:
-#ifdef __POCKETPC__
-    bool        m_contextMenuEnabled;
-#endif
-
     wxDECLARE_DYNAMIC_CLASS(wxWindowMSW);
     wxDECLARE_NO_COPY_CLASS(wxWindowMSW);
     wxDECLARE_EVENT_TABLE();