Restart work on lg_create_custom_legend to get nice custom multi line legends
Rewritten lg_create_custom_legend
 * Now include item lines, marker and labels, perimeter box and handling of lgTitleOffsetF
 * Commented most of the default values to let NGL decide on the defaults for text, polygons, marker and polylines. However, these differe from the usual legend defaults by NGL. Only defaults neccessary to draw the legend are set.