libsysprof-ui: land new UI design

This comprises a massive rewrite of the UI for browsing captures. We use
the SysprofAid class to scan capture files for content and then auto-
matically add visualizers and details pages.

To avoid breaking things incrementally, we just land this as a very large
commit. Not necessarily ideal, but given the amount of stuff that could
break, this is easier.

As part of this process, we're removing a lot of the surface API so that
we can limit how much we need to maintain in terms of ABI.

src/libsysprof-ui/sysprof-cell-renderer-duration.c

@@ -110,7 +110,7 @@ sysprof_cell_renderer_duration_render (GtkCellRenderer      *renderer,
 
   if (r.width > 3)
     {
-      _sysprof_rounded_rectangle (cr, &r, 2, 2);
+      dzl_cairo_rounded_rectangle (cr, &r, 2, 2);
       cairo_fill (cr);
     }
   else if (r.width > 1)