Add wxRichMessageDialog class.

This is a generalization of wxMessageDialog based on the native task dialog
under recent (Vista and later) Windows versions and implemented generically
for the other ports for now.

It provides the possibility to use additional controls in the message boxes
(checkbox useful for the "Don't ask me again" kind of dialogs and collapsible
detailed explanations field) and better look and feel under Windows.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65349 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure.in

@@ -898,6 +898,7 @@ if test "$wxUSE_CONTROLS" = "no"; then
     DEFAULT_wxUSE_POPUPWIN=no
     DEFAULT_wxUSE_RADIOBOX=no
     DEFAULT_wxUSE_RADIOBTN=no
+    DEFAULT_wxUSE_RICHMSGDLG=no
     DEFAULT_wxUSE_REARRANGECTRL=no
     DEFAULT_wxUSE_SASH=no
     DEFAULT_wxUSE_SCROLLBAR=no
@@ -961,6 +962,7 @@ WX_ARG_FEATURE(odcombobox,  [  --enable-odcombobox     use wxOwnerDrawnComboBox
 WX_ARG_FEATURE(popupwin,    [  --enable-popupwin       use wxPopUpWindow class], wxUSE_POPUPWIN)
 WX_ARG_FEATURE(radiobox,    [  --enable-radiobox       use wxRadioBox class], wxUSE_RADIOBOX)
 WX_ARG_FEATURE(radiobtn,    [  --enable-radiobtn       use wxRadioButton class], wxUSE_RADIOBTN)
+WX_ARG_FEATURE(richmsgdlg,  [  --enable-richmsgdlg     use wxRichMessageDialog class], wxUSE_RICHMSGDLG)
 WX_ARG_FEATURE(rearrangectrl,[  --enable-rearrangectrl  use wxRearrangeList/Ctrl/Dialog], wxUSE_REARRANGECTRL)
 WX_ARG_FEATURE(sash,        [  --enable-sash           use wxSashWindow class], wxUSE_SASH)
 WX_ARG_FEATURE(scrollbar,   [  --enable-scrollbar      use wxScrollBar class and scrollable windows], wxUSE_SCROLLBAR)
@@ -6970,6 +6972,10 @@ if test "$wxUSE_REARRANGECTRL" = "yes"; then
     AC_DEFINE(wxUSE_REARRANGECTRL)
 fi
 
+if test "$wxUSE_RICHMSGDLG" = "yes"; then
+    AC_DEFINE(wxUSE_RICHMSGDLG)
+fi
+
 if test "$wxUSE_SASH" = "yes"; then
     AC_DEFINE(wxUSE_SASH)
     SAMPLES_SUBDIRS="$SAMPLES_SUBDIRS sashtest"