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/pharmacy.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg version="1.1" id="pharmacy" xmlns="http://www.w3.org/2000/svg" width="15" height="15" viewBox="0 0 15 15">
+  <path d="M9.5,4l1.07-1.54c0.0599,0.0046,0.1201,0.0046,0.18,0c0.6904-0.0004,1.2497-0.5603,1.2494-1.2506&#xA;&#x9;C11.999,0.519,11.4391-0.0404,10.7487-0.04C10.0584-0.0396,9.499,0.5203,9.4994,1.2106c0,0.0131,0.0002,0.0262,0.0006,0.0394&#xA;&#x9;c0,0,0,0.07,0,0.1L7,4H9.5z M12,6V5H3v1l1.5,3.5L3,13v1h9v-1l-1-3.5L12,6z M10,10H8v2H7v-2H5V9h2V7h1v2h2V10z"/>
+</svg>