Make wxTaskBarIcon's ctor have the same API on all platforms even though setting the icon type can only be done on wxOSX-cocoa

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71242 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/taskbar.h

@@ -6,6 +6,18 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
+/**
+   On OSX Cocoa the taskbar icon can be in the doc or in the status area.
+   This enumeration can be used to select which will be instantiated.
+*/
+enum wxTaskBarIconType
+{
+    wxTBI_DOCK,
+    wxTBI_CUSTOM_STATUSITEM,
+    wxTBI_DEFAULT_TYPE
+};
+
+
 
 /**
     @class wxTaskBarIconEvent
@@ -26,6 +38,7 @@ public:
     wxTaskBarIconEvent(wxEventType evtType, wxTaskBarIcon *tbIcon);
 };
 
+
 /**
     @class wxTaskBarIcon
 
@@ -79,9 +92,9 @@ class wxTaskBarIcon : public wxEvtHandler
 {
 public:
     /**
-        Default constructor.
+        Default constructor.  The iconType is only applicable on wxOSX_Cocoa.
     */
-    wxTaskBarIcon();
+    wxTaskBarIcon(wxTaskBarIconType iconType = wxTBI_DEFAULT_TYPE);
 
     /**
         Destroys the wxTaskBarIcon object, removing the icon if not already removed.