Use wxDataViewRenderer::PrepareForItem() in all ports

wxOSX and wxGTK previously used their own methods for handling the enabled
state and the attributes of the items being rendered, change them to reuse the
same methods as the generic implementation, i.e. SetEnabled() and SetAttr()
and remove the port-specific GtkSetAttr(), OSXApplyAttr() and so on.

This has the advantage of ensuring that the logic is the same for all
platforms (e.g. item enabled status wasn't handled in the same way in wxGTK as
in the other ports previously) and hopefully makes the code simpler by cutting
down on the number of virtual methods.

Notice that GtkSupportsAttrs() optimization was removed as it didn't seem to
be worth the bother (we basically saved a call to a virtual model method at a
price of a virtual renderer method call) and preserving it would have
complicated things needlessly.

include/wx/osx/dvrenderers.h

@@ -31,10 +31,6 @@ public:
 
     virtual bool MacRender();
 
-#if wxOSX_USE_COCOA
-    virtual void OSXApplyAttr(const wxDataViewItemAttr& attr);
-#endif // Cocoa
-
     virtual wxDC* GetDC(); // creates a device context and keeps it
     void SetDC(wxDC* newDCPtr); // this method takes ownership of the pointer