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/information.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg version="1.1" id="information" xmlns="http://www.w3.org/2000/svg" width="15" height="15" viewBox="0 0 15 15">
+  <path id="rect8399" d="M7.5,1&#xA;&#x9;C6.7,1,6,1.7,6,2.5S6.7,4,7.5,4S9,3.3,9,2.5S8.3,1,7.5,1z M4,5v1c0,0,2,0,2,2v2c0,2-2,2-2,2v1h7v-1c0,0-2,0-2-2V6c0-0.5-0.5-1-1-1H4&#xA;&#x9;z"/>
+</svg>