Restores the "subway map" chart on new Last.fm report pages
This userscript runs on new-style (dark) report pages on Last.fm and restores the old "subway map" chart for weekly, monthly, and yearly reports. It does not run on the older style pages, which currently retain the "subway map" chart.
The chart is built using d3 v4 and a hand-made recreation of the original SVG chart layout. The original charts are made using highcharts, but I was unable to find a way to utilize that engine in the browser. I think d3 was able to reproduce it adequately. It also utilizes jquery, jquery-address, and wait-for-key-elements.
