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/maki/school-JP.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg id="school-JP" xmlns="http://www.w3.org/2000/svg" width="15" height="15" viewBox="0 0 15 15">
+  <path d="M12.5,2.9992h-4v-1a1,1,0,0,0-2,0v1h-4a1,1,0,0,0,0,2h.67A10.8169,10.8169,0,0,0,5.15,8.8105c.3331.4313.6594.8248.9785,1.1936a14.3825,14.3825,0,0,1-2.6074,2.117,1,1,0,1,0,.955,1.7581h0A15.65,15.65,0,0,0,7.5,11.4613a15.65,15.65,0,0,0,3.0239,2.4179,1,1,0,1,0,.9551-1.7578,14.3789,14.3789,0,0,1-2.6073-2.1171c.3191-.3688.6453-.7622.9784-1.1935a10.818,10.818,0,0,0,1.98-3.8116h.67a1,1,0,0,0,0-2ZM8.2671,7.5879c-.2614.3385-.5154.6413-.767.937-.2517-.2957-.5057-.5985-.7672-.937A9.5885,9.5885,0,0,1,5.2676,4.9992H9.7319A9.5789,9.5789,0,0,1,8.2671,7.5879Z"/>
+</svg>