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/coffee.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="M13.5 1C14 0.5 6.5 0 3 3.5C1 5.5 0 8.5 0 10C0 12 1 15 3 15C10 15 12.5 9.5 13.5 7.5C14.5 5.5 15 1.5 14 1.5C13.5 1.5 11 3 10 4C9 5 9 7 8 8C7 9 5.5 9 4.5 10C3.5 11 2 12.5 2 12.5C2 12.5 2.5 10 3.5 9C4.5 8 5.5 8 6.5 7C7.5 6 8 4 9 3C10 2 13 1.5 13.5 1z"/>
+</svg>