preparation for allowing to use wxTimer in wxBase (heavily modified patch 1113088):

1. Changed wxTimer to use wxTimerImpl
2. Added Unix-specific generic timer implementation
3. Added wxAppTraits::CreateTimerImpl()


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45544 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/carbon/apptrait.h

@@ -19,6 +19,10 @@
 class WXDLLEXPORT wxConsoleAppTraits : public wxConsoleAppTraitsBase
 {
 public:
+    // no timer support in wxBase yet
+#if wxUSE_TIMER
+    virtual wxTimerImpl *CreateTimerImpl(wxTimer *timer) { return NULL; };
+#endif
     // other miscellaneous helpers
     // ---------------------------
 
@@ -30,6 +34,9 @@ public:
 class WXDLLEXPORT wxGUIAppTraits : public wxGUIAppTraitsBase
 {
 public:
+#if wxUSE_TIMER
+    virtual wxTimerImpl *CreateTimerImpl(wxTimer *timer);
+#endif
     // other miscellaneous helpers
     // ---------------------------