musicxml2ly: multi-lined headers collide

[pls]

Hey all,

header elements containing several lines of text including line breaks, e.g.

      <creator type="composer">John Francis Wade (1711–1786)</creator>
      <creator type="lyricist">German: Friedrich Heinrich Ranke (1798–1876)
Latin: John Francis Wade (1711–1786)</creator>

are converted by musicxml2ly v2.15.29 into single lines of text without line 
breaks, leading to text collisions.

multi-lined-headers.xml
Description: application/xml

Possible solution:
musicxml2ly should convert multi-lined headers into columns, e.g.:

    composer = "John Francis Wade (1711–1786)"
    poet = \markup { 
      \column { 
        \line {"German: Friedrich Heinrich Ranke (1798–1876)"} 
        \line {"Latin: John Francis Wade (1711–1786)"} 
      } 
    }

hth
patrick