editor: do not use MFC header

afxres.h is MFC-ism, and is not included in Visual Studio Express 2008.
To avoid confusing the resource editor in other visual studio versions,
let's implement a minimal version ourselves.

editor/afxres.h

@@ -0,0 +1,12 @@
+#include <windows.h>
+#define ID_FILE_NEW                     0xE100
+#define ID_FILE_OPEN                    0xE101
+#define ID_FILE_SAVE                    0xE103
+#define ID_FILE_SAVE_AS                 0xE104
+#define ID_EDIT_CLEAR                   0xE120
+#define ID_EDIT_COPY                    0xE122
+#define ID_EDIT_CUT                     0xE123
+#define ID_EDIT_PASTE                   0xE125
+#define ID_EDIT_SELECT_ALL              0xE12A
+#define ID_EDIT_UNDO                    0xE12B
+#define ID_EDIT_REDO                    0xE12C

editor/editor.cpp

@@ -3,7 +3,7 @@
  */
 
 #include "../sync/base.h"
-#include <afxres.h>
+#include "afxres.h"
 #include "resource.h"
 
 #include <commctrl.h>