The value of wrap_flag in the Text Wrap Box specifies if the text is to
be wrapped or not. Uses 'end of line wrap' amongst the wrap styles
supported by ASS if the text is to be wrapped, i.e; fill as much text
in a line as possible, then break to next line.

The 3GPP spec has no provision for smart wrapping.
Signed-off-by: Niklesh <niklesh.lalwani@iitb.ac.in>