40C3: tours, schedule data, tour map and calendar entries

- tour-map shortcode: Leaflet map of the tour locations with routes from the
  Congress, from the map/tours sections of data/schedule/<event>.yaml; Leaflet
  and the OSMIC, Maki and Temaki icon sets vendored; 39C3 uMap data converted.
- calendar shortcode: per tour date, a pill with an .ics download (iCalendar)
  and a Google Calendar link; Font Awesome Free vendored, fa-icon partial.
- README sections for the calendar and tour map shortcodes and the map data.

assets/vendor/icons/temaki/handbag.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0" y="0" viewBox="0 0 15 15">
+  <path d="M14.5 6.5C14.5 9 14 11 12.5 11C12.5 11 2.5 11 2.5 11C1 11 0.5 9 0.5 6.5C6.5 9.5 8.5 9.5 14.5 6.5zM7.5 5.5C7.88 5.5 8.25 5.88 8.25 6.25C8.25 6.63 7.88 7 7.5 7C7.13 7 6.75 6.63 6.75 6.25C6.75 5.88 7.13 5.5 7.5 5.5zM13 4.5L2 4.5C1 4.5 0.5 5 0.5 6C6.5 9 8.5 9 14.5 6C14.5 5 14 4.5 13 4.5z"/>
+</svg>