Log Message:
tex-beamer{,-doc}: update to 3.58

- re-introduced `\strut` after the frametitle
- Promote bookmark level for index
- clip `\insertslideintonotes` to show only visible area
- using biblatex filehooks to make adjustments to the bibliography appearence
- Avoid loop with overlayarea in vmode
- Handling of `\\` in article mode