Remove wx/{checklst,wfstream,version,variant,types}.h from *.h

src/commands/CommandMisc.h

@@ -17,8 +17,9 @@
 #define __COMMANDMISC__
 
 #include <map>
-#include <wx/variant.h>
 #include "Validators.h"
+
+class wxVariant;
 class OldStyleCommandType;
 
 // Map from parameter name to the value of the parameter

src/commands/Validators.h

@@ -47,6 +47,8 @@ class wxArrayString;
 
 #include "../MemoryX.h"
 
+#include <wx/variant.h> // member variable
+
 class Validator /* not final */
 {
 private: