QStaticText and QTextDocument need a way to limit number of lines and elide

https://projects.maemo.org/bugzilla/show_bug.cgi?id=260814

We need a way to display only, say, 3 lines of text, eliding at the end.

For example:

QTextOption option = m_staticText.textOption();
option.setWrapMode(QTextOption::WordWrap);
/* Proposed API */
option.setMaximumNumberOfLines(maxLines);
option.setElide(true);
option.setElideText("...");
m_staticText.setTextOption(option);