Previously, OptionRowHandler was owned and freed by

ScreenOptionsMaster (and ScreenOptionsManageProfiles).
Make it owned by OptionRow; the only pointer to them
is where they're stored in the OptionRow.  This
eliminates the remaining association between m_OptionRowHandlers
and m_pRows; that was confusing, because they're in
different places, and aren't always the same size.  It
also simplifies using OptionRowHandlers.

stepmania/src/ScreenOptions.cpp

@@ -205,7 +205,6 @@ void ScreenOptions::InitMenu( const vector<OptionRowDefinition> &vDefs, const ve
 	for( unsigned i=0; i<m_pRows.size(); i++ )
 	{
 		m_framePage.RemoveChild( m_pRows[i] );
-		m_pRows[i]->DetachHandler();
 		SAFE_DELETE( m_pRows[i] );
 	}
 	m_pRows.clear();