Overview of changes in Sysprof 47.0
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 * Speed up capture loading using gtk_tim_sort().
 * Speed up capture loading using a private bump allocator
   for callgraph nodes.
 * Use AdwAboutDialog.
 * Add GIO and Mutter to graphics section.
 * Fix use of tracefd on some child processes.
 * Fix some use of blocking FDs.
 * Collapse some recursive functions in callgraphs.
 * Improve styling of waterfall labels.
 * Allow polkit to be optional in some situations.
 * Translation updates.