Use signals instead of onscreen framebuffer frame callbacks

CoglFrameInfo is a frame info container associated with a single
onscreen framebuffer. The clutter stage will eventually support drawing
a stage frame with multiple onscreen framebuffers, thus needs its own
frame info container.

This patch introduces a new stage signal 'presented' and a accompaning
ClutterFrameInfo and adapts the stage windows and past onscreen frame
callbacks users to use the signal and new info container.

https://bugzilla.gnome.org/show_bug.cgi?id=768976

clutter/clutter/clutter-types.h

@@ -51,6 +51,7 @@ G_BEGIN_DECLS
 typedef struct _ClutterActor                    ClutterActor;
 
 typedef struct _ClutterStage                    ClutterStage;
+typedef struct _ClutterFrameInfo                ClutterFrameInfo;
 typedef struct _ClutterContainer                ClutterContainer; /* dummy */
 typedef struct _ClutterChildMeta                ClutterChildMeta;
 typedef struct _ClutterLayoutMeta               ClutterLayoutMeta;