Let \raise and \lower heed font-size (issue 343330043 by address@hidden)

[lilypond]

This needs an entry in changes.tely, maybe with an example like

\markup {
  A \raise #1.5 A
  \fontsize #6 {
    A \raise #1.5 A
  }
}

https://codereview.appspot.com/343330043/