revised a* interface headers; categorized many functions; moved some functions to their correct header

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52499 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/animate.h

@@ -170,7 +170,6 @@ public:
 
 /**
     @class wxAnimation
-    @ingroup group_class_gdi
     @wxheader{animate.h}
 
     This class encapsulates the concept of a platform-dependent animation.
@@ -270,6 +269,11 @@ public:
     wxAnimation operator =(const wxAnimation& brush);
 };
 
+
+// ============================================================================
+// Global functions/macros
+// ============================================================================
+
 /**
     An empty animation object.
 */