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/school.svg

@@ -0,0 +1,5 @@
+<?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="M10 0L10 15C10 15 0 15 0 15C0 15 0 0 0 0L10 0zM9 1L1 1L1 14C1 14 9 14 9 14L9 1zM2.5 4C2.5 4 7.5 4 7.5 4C8 4 8 5 7.5 5C7.5 5 2.5 5 2.5 5C2 5 2 4 2.5 4zM2.5 6C2.5 6 7.5 6 7.5 6C8 6 8 7 7.5 7C7.5 7 2.5 7 2.5 7C2 7 2 6 2.5 6zM2.5 8C2.5 8 7.5 8 7.5 8C8 8 8 9 7.5 9C7.5 9 2.5 9 2.5 9C2 9 2 8 2.5 8zM2.5 10C2.5 10 7.5 10 7.5 10C8 10 8 11 7.5 11C7.5 11 2.5 11 2.5 11C2 11 2 10 2.5 10z"/>
+  <path d="M11 13C11.5 13.5 13.5 13.5 14 13C14 13 13 15 12.5 15C12 15 11 13 11 13zM11 3C11 3.5 14 3.5 14 3C14 3 14 12 14 12C14 12.5 11 12.5 11 12C11 12 11 3 11 3zM12.5 0C11 0 11 0.5 11 1C11 1 11 2 11 2C11 2.5 14 2.5 14 2C14 2 14 1 14 1C14 0.5 14 0 12.5 0z"/>
+</svg>