Added new components for plotting: Plot, DOS and BandStructure. The DOS and BS plots are now also integrated to the ArchiveBrowser where they are shown in the overview.
The plotting is based on the Plotly.js library and a custom React component built around it. The plots can be reset, 'floated' and captured. The preset for capturing probably needs some tweaking: currently the plots are exported as SVG files with fixed width.
The Brillouin zone viewer still needs some work, so I did not include it yet.