Allow customizing wxBusyInfo appearance.

Allow customizing wxBusyInfo window by passing wxBusyInfoFlags containing
information about the icon, title, colours and frame transparency to use.

Update the sample to show such "rich" busy info.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78063 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/dialogs/dialogs.h

@@ -441,6 +441,7 @@ public:
 
 #if wxUSE_BUSYINFO
     void ShowBusyInfo(wxCommandEvent& event);
+    void ShowRichBusyInfo(wxCommandEvent& event);
 #endif // wxUSE_BUSYINFO
 
 #if wxUSE_FINDREPLDLG
@@ -577,6 +578,7 @@ enum
     DIALOGS_ABOUTDLG_FULL,
     DIALOGS_ABOUTDLG_CUSTOM,
     DIALOGS_BUSYINFO,
+    DIALOGS_BUSYINFO_RICH,
     DIALOGS_FIND,
     DIALOGS_REPLACE,
     DIALOGS_REQUEST,