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

src/msw/main.cpp

@@ -40,14 +40,6 @@
     #include "wx/msw/crashrpt.h"
 #endif // wxUSE_ON_FATAL_EXCEPTION
 
-#ifdef __WXWINCE__
-    // there is no ExitProcess() under CE but exiting the main thread has the
-    // same effect
-    #ifndef ExitProcess
-        #define ExitProcess ExitThread
-    #endif
-#endif // __WXWINCE__
-
 #ifdef __BORLANDC__
     // BC++ has to be special: its run-time expects the DLL entry point to be
     // named DllEntryPoint instead of the (more) standard DllMain
@@ -270,11 +262,6 @@ wxMSWEntryCommon(HINSTANCE hInstance, int nCmdShow)
         args = wxCmdLineParser::ConvertStringToArgs(cmdLine);
     }
 
-#ifdef __WXWINCE__
-    // WinCE doesn't insert the program itself, so do it ourselves.
-    args.Insert(wxGetFullModuleName(), 0);
-#endif
-
     wxArgs.Init(args);
 
     return true;