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/book_store.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="M11.5 0C12.5 0 13 0 13 1C13 1 13 14 13 14C13 15 12.5 15 11.5 15C11.5 15 3.5 15 3.5 15C2.5 15 2 15 2 14L2 1C2 0 2.5 0 3.5 0L11.5 0zM12.5 12.5L3 12.5C3 12.5 3 13.5 3 13.5C3 14 3.5 14 3.5 14L12.5 14L12.5 12.5zM10.5 5C10.5 5 4.5 5 4.5 5C4 5 4 6 4.5 6C4.5 6 10.5 6 10.5 6C11 6 11 5 10.5 5zM10.5 3C10.5 3 4.5 3 4.5 3C4 3 4 4 4.5 4C4.5 4 10.5 4 10.5 4C11 4 11 3 10.5 3z"/>
+</svg>