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/treectrl.cpp

@@ -767,7 +767,7 @@ bool wxTreeCtrl::Create(wxWindow *parent,
             wstyle |= TVS_FULLROWSELECT;
     }
 
-#if !defined(__WXWINCE__) && defined(TVS_INFOTIP)
+#if defined(TVS_INFOTIP)
     // Need so that TVN_GETINFOTIP messages will be sent
     wstyle |= TVS_INFOTIP;
 #endif
@@ -2967,7 +2967,6 @@ wxTreeCtrl::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
                 break;
 
             case WM_MOUSEMOVE:
-#ifndef __WXWINCE__
                 if ( m_htClickedItem )
                 {
                     int cx = abs(m_ptClick.x - x);
@@ -3014,7 +3013,6 @@ wxTreeCtrl::MSWWindowProc(WXUINT nMsg, WXWPARAM wParam, WXLPARAM lParam)
                         }
                     }
                 }
-#endif // __WXWINCE__
 
 #if wxUSE_DRAGIMAGE
                 if ( m_dragImage )
@@ -3320,7 +3318,6 @@ bool wxTreeCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
                 break;
             }
 
-#ifndef __WXWINCE__
         // These *must* not be removed or TVN_GETINFOTIP will
         // not be processed each time the mouse is moved
         // and the tooltip will only ever update once.
@@ -3344,7 +3341,6 @@ bool wxTreeCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
                 break;
             }
 #endif // TVN_GETINFOTIP
-#endif // !__WXWINCE__
 
         case TVN_GETDISPINFO:
             eventType = wxEVT_TREE_GET_INFO;
@@ -3775,7 +3771,6 @@ bool wxTreeCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
             DeleteTextCtrl();
             break;
 
-#ifndef __WXWINCE__
 #ifdef TVN_GETINFOTIP
          case TVN_GETINFOTIP:
             {
@@ -3786,7 +3781,6 @@ bool wxTreeCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
                 }
             }
             break;
-#endif
 #endif
 
         case TVN_SELCHANGING: