second part of #10320: move wxApp event handling functions to wxEventLoopBase (in particular move Yield() functions); add backward compatible redirections to wxApp; update docs; remove global lists wxPendingEvents and wxPendingEventsLocker

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58911 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/unix/evtloop.h

@@ -37,6 +37,7 @@ public:
     virtual int DispatchTimeout(unsigned long timeout);
     virtual void WakeUp();
     virtual bool IsOk() const { return m_dispatcher != NULL; }
+    virtual bool YieldFor(long WXUNUSED(eventsToProcess)) { return true; }
 
 protected:
     virtual void OnNextIteration();