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/speaker.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="M5 1L10 1C10.5 1 11 1.5 11 2L11 13C11 13.5 10.5 14 10 14L5 14C4.5 14 4 13.5 4 13L4 2C4 1.5 4.5 1 5 1zM7.5 2.5C6.4 2.5 5.5 3.4 5.5 4.5C5.5 5.61 6.4 6.5 7.5 6.5C8.61 6.5 9.5 5.61 9.5 4.5C9.5 3.4 8.61 2.5 7.5 2.5zM7.5 3.5C8.05 3.5 8.5 3.95 8.5 4.5C8.5 5.05 8.05 5.5 7.5 5.5C6.95 5.5 6.5 5.05 6.5 4.5C6.5 3.95 6.95 3.5 7.5 3.5zM7.5 8C6.12 8 5 9.12 5 10.5C5 11.88 6.12 13 7.5 13C8.88 13 10 11.88 10 10.5C10 9.12 8.88 8 7.5 8zM7.5 9C8.33 9 9 9.67 9 10.5C9 11.33 8.33 12 7.5 12C6.67 12 6 11.33 6 10.5C6 9.67 6.67 9 7.5 9z"/>
+</svg>