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/boulder2.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="M6 14C5.33 14 1 13.78 1 12C1 9.36 2.96 7.54 3.5 7C4.54 5.96 4.43 4.63 5 3.5C5.77 1.96 7.79 1 8.5 1C9.07 1 10.75 2.3 12 4C12.56 4.75 14 8.37 14 9.5C14 13.08 12.34 14 11 14C9.66 14 9.19 14 6 14z"/>
+</svg>