Add wxEXEC_HIDE_CONSOLE flag allowing to unconditionally do it under MSW.

Also renamed wxEXEC_NOHIDE to wxEXEC_SHOW_CONSOLE for symmetry (keeping the
old name for compatibility, of course).

Extend exec sample to allow easily testing the different flags and adding more
of them later.

See #13676.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69964 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/utils.h

@@ -334,7 +334,11 @@ enum
 
     // under Windows, don't hide the child even if it's IO is redirected (this
     // is done by default)
-    wxEXEC_NOHIDE   = 2,
+    wxEXEC_SHOW_CONSOLE   = 2,
+
+    // deprecated synonym for wxEXEC_SHOW_CONSOLE, use the new name as it's
+    // more clear
+    wxEXEC_NOHIDE = wxEXEC_SHOW_CONSOLE,
 
     // under Unix, if the process is the group leader then passing wxKILL_CHILDREN to wxKill
     // kills all children as well as pid
@@ -350,6 +354,10 @@ enum
     // until the child process finishes
     wxEXEC_NOEVENTS = 16,
 
+    // under Windows, hide the console of the child process if it has one, even
+    // if its IO is not redirected
+    wxEXEC_HIDE_CONSOLE = 32,
+
     // convenient synonym for flags given system()-like behaviour
     wxEXEC_BLOCK = wxEXEC_SYNC | wxEXEC_NOEVENTS
 };