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/electronic.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="M11 4C11 4 11 1 11 1C11 0 10 0 10 1C10 1 10 4 10 4L5 4C5 4 5 1 5 1C5 0 4 0 4 1C4 1 4 4 4 4C4 4 2.5 4 2.5 4C1.5 4 1.5 5.5 2 6.5C2.5 7.5 3.5 9.5 3.5 12C3.5 12 3.5 14 4.5 14C4.5 14 6 14 6 14L6 15L9 15L9 14C9 14 10.5 14 10.5 14C11.5 14 11.5 12 11.5 12C11.5 9.5 12.5 7.5 13 6.5C13.5 5.5 13.5 4 12.5 4M7.25 9.5C7.25 9.5 5.5 9.5 5.5 9.5C5.5 9.5 8.5 5.5 8.5 5.5C8.5 5.5 8 8.5 8 8.5C8 8.5 10 8.5 10 8.5C10 8.5 7 12.5 7 12.5"/>
+</svg>