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/security_camera.svg

@@ -0,0 +1,6 @@
+<?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="M0 2C0 2 5 2 5 2C5 2 15 6.5 15 6.5C15 6.5 7.75 6.5 7.75 6.5C7.75 6.5 0 2 0 2z"/>
+  <path d="M0 2.5C0 2.5 7.5 7 7.5 7C7.5 7 5.5 12.5 5.5 12.5C5.5 12.5 0 6 0 6C0 6 0 2.5 0 2.5z"/>
+  <path d="M15 7C15 7 12.5 12.5 12.5 12.5C12.5 12.5 6 12.5 6 12.5C6 12.5 8 7 8 7L15 7zM10.13 7.5C8.95 7.5 8 8.35 8 9.4C8 10.45 8.95 11.3 10.13 11.3C11.3 11.3 12.25 10.45 12.25 9.4C12.25 8.35 11.3 7.5 10.13 7.5z"/>
+</svg>