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/industry.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg version="1.1" id="industry" xmlns="http://www.w3.org/2000/svg" width="15" height="15" viewBox="0 0 15 15">
+  <path d="M14,1v12H1V8.72c0.0016-0.1419,0.0634-0.2764,0.17-0.37l3-3.22c0.2074-0.1823,0.5234-0.1618,0.7056,0.0456&#xA;&#x9;C4.9568,5.268,5.0011,5.387,5,5.51v3l3.16-3.37c0.2025-0.1878,0.5188-0.1759,0.7066,0.0266C8.9532,5.2599,9.0009,5.3827,9,5.51V11h3&#xA;&#x9;V1H14z"/>
+</svg>