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/ear.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="M7 0C11 0 13 2 13 5C13 7.5 11 8.5 10.5 11C10 12.5 9 15 7 15C5 15 4.5 13.5 3.5 12C2.5 10.5 3.5 10 4 10.5C4.5 11 5.5 14 7 14C8 14 9 12 9.5 10.5C10 8 12 7 12 5C12 2.5 10.5 1 7 1C4.5 1 3.5 2.5 3.5 4C3.5 5 2.5 5 2.5 4C2.5 1.5 4 0 7 0zM7.5 2.5C5.5 2.5 4.5 3.5 4.5 5C4.5 6 4.5 7 5 7.5C5.5 8 6 8.5 5.5 9C5 9.5 6 10.5 7 9C7.5 8 7 7.5 6.5 7C6 6.5 5.5 6 5.5 5C5.5 4.5 6 3 7.5 3C8.5 3 10 3.5 10 5C10 6.5 9 7.5 9.5 7.5C10 7.5 10.5 6 10.5 5C10.5 3 8.5 2.5 7.5 2.5z"/>
+</svg>