0.0.19

• use sheet-viewer / table-viewer for viewer of corresponding edit mode
• use table for sheet-viewer for better layout and alignment
• tweak sheet cell max height
• check empty line against undefined and also '' (only for sheet-viewer)
• skip sheet update if not in sheet mode to prevent data corruption
• move lc into init function to prevent unexpected wrong scope
• force cell size for name fields also in viewer mode
• ensure minimal cell width 5.5em for viewer mode