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/boulder1.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="M4 14C2.21 14 1.5 11.44 1.5 9C1.5 6.8 2.83 6.68 3.5 5C4.69 2.02 6.5 2 6.5 2C6.5 2 11 1.5 11 1.5C13.98 1.5 12.68 3 13.5 5.5C14.3 7.93 11.59 9.53 11 11C10.51 12.24 9.48 14 6.5 14C6.5 14 6.38 14 4 14z"/>
+</svg>