Added wxSimplebook class: a wxBookCtrl without controller.

This new control allows the program to show one of the several pages without
allowing the user to change them (or even see that there are several of them)
himself.

This class is fully inline, so it doesn't add anything to the library and
hence doesn't need neither wxUSE_SIMPLEBOOK nor the corresponding configure
option.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72407 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -535,8 +535,9 @@ All:
 
 All (GUI):
 
-- Add support for searching in wxWebView for MSW and GTK (Allonii).
+- Add new wxSimplebook class.
 - Respect window max size in wxBoxSizer (Nathan Ridge).
+- Add support for searching in wxWebView for MSW and GTK (Allonii).
 - Add possibility to hide and show again wxRibbonBar pages (wxBen).
 - Add wxRibbonBar pages highlighting (wxBen).
 - Add expand/collapse button to wxRibbonBar (rakeshthp).

docs/doxygen/mainpages/cat_classes.h

@@ -254,6 +254,8 @@ The following are a variety of classes that are derived from wxWindow.
 @li wxSashWindow: Window with four optional sashes that can be dragged
 @li wxSashLayoutWindow: Window that can be involved in an IDE-like layout
     arrangement
+@li wxSimplebook: Another book control but one allowing only the program, not
+    the user, to change its current page.
 @li wxWizardPage: A base class for the page in wizard dialog.
 @li wxWizardPageSimple: A page in wizard dialog.
 @li wxCustomBackgroundWindow: A window allowing to set a custom bitmap.

docs/doxygen/overviews/bookctrl.h

@@ -15,6 +15,7 @@ Classes:
 @li wxChoicebook
 @li wxListbook
 @li wxNotebook
+@li wxSimplebook
 @li wxTreebook
 @li wxToolbook
 
@@ -35,11 +36,15 @@ displayed one page at a time. wxWidgets has five variants of this control:
 @li wxChoicebook: controlled by a wxChoice
 @li wxListbook: controlled by a wxListCtrl
 @li wxNotebook: uses a row of tabs
+@li wxSimplebook: doesn't allow the user to change the page at all.
 @li wxTreebook: controlled by a wxTreeCtrl
 @li wxToolbook: controlled by a wxToolBar
 
 See the @ref page_samples_notebook for an example of wxBookCtrl usage.
 
+Notice that wxSimplebook is special in that it only allows the program to
+change the selection, thus it's usually used in slightly different
+circumstances than the other variants.
 
 @section overview_bookctrl_bestbookctrl Best Book