Make wxAnimationImpl private and get rid of wxAnimationImplType

Simplify and streamline animation classes relationship: wxAnimation is
the only public class representing an animation and it can be created by
both the native wxAnimationCtrl and wxGenericAnimationCtrl using the new
public CreateAnimation() method.

Replace wxAnimationImplType enum with more flexible type info based
check.

include/wx/generic/private/animate.h

@@ -11,6 +11,8 @@
 #ifndef _WX_GENERIC_PRIVATE_ANIMATEH__
 #define _WX_GENERIC_PRIVATE_ANIMATEH__
 
+#include "wx/private/animate.h"
+
 // ----------------------------------------------------------------------------
 // wxAnimationGenericImpl
 // ----------------------------------------------------------------------------
@@ -21,11 +23,9 @@ public:
     wxAnimationGenericImpl() : m_decoder(NULL) {}
     virtual ~wxAnimationGenericImpl() { UnRef(); }
 
-    virtual wxAnimationImplType GetImplType() wxOVERRIDE
-        { return wxANIMATION_IMPL_TYPE_GENERIC; }
-
     virtual bool IsOk() const wxOVERRIDE
         { return m_decoder != NULL; }
+    virtual bool IsCompatibleWith(wxClassInfo* ci) const wxOVERRIDE;
 
     virtual unsigned int GetFrameCount() const wxOVERRIDE;
     virtual int GetDelay(unsigned int i) const wxOVERRIDE;