Add MetaCursorTracker, a new helper for tracking the cursor sprite

Under X, we need to use XFixes to watch the cursor changing, while
on wayland, we're in charge of setting and painting the cursor.
MetaCursorTracker provides the abstraction layer for gnome-shell,
which can thus drop ShellXFixesCursor. In the future, it may grow
the ability to watch for pointer position too, especially if
CursorEvents are added to the next version of XInput2, and thus
it would also replace the PointerWatcher we use for gnome-shell's
magnifier.

https://bugzilla.gnome.org/show_bug.cgi?id=705911

src/core/screen-private.h

@@ -93,6 +93,7 @@ struct _MetaScreen
   MetaStack *stack;
   MetaStackTracker *stack_tracker;
 
+  MetaCursorTracker *cursor_tracker;
   MetaCursor current_cursor;
 
   Window flash_window;
@@ -259,4 +260,7 @@ void meta_screen_set_active_workspace_hint (MetaScreen *screen);
 
 Window   meta_screen_create_guard_window (Display *xdisplay, MetaScreen *screen);
 
+gboolean meta_screen_handle_xevent (MetaScreen *screen,
+                                    XEvent     *xevent);
+
 #endif