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/os2/apptrait.h

@@ -19,6 +19,9 @@
 class WXDLLIMPEXP_BASE wxConsoleAppTraits : public wxConsoleAppTraitsBase
 {
 public:
+#if wxUSE_TIMER
+    virtual wxTimerImpl *CreateTimerImpl(wxTimer *timer) { return NULL; };
+#endif
 };
 
 #if wxUSE_GUI
@@ -26,6 +29,9 @@ public:
 class WXDLLIMPEXP_CORE wxGUIAppTraits : public wxGUIAppTraitsBase
 {
 public:
+#if wxUSE_TIMER
+    virtual wxTimerImpl *CreateTimerImpl(wxTimer *timer);
+#endif
     virtual wxPortId GetToolkitVersion(int *majVer, int *minVer) const;
 
     // wxThread helpers