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/water_device.svg

@@ -0,0 +1,5 @@
+<?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="M9 0.5C9 0.5 9 1 9 1C9 1 12.5 1 12.5 1C13 1 13 1.5 13 1.5L13 13.5C13 13.5 13 14 12.5 14C12.5 14 9 14 9 14L9 14.5C9 15 6 15 6 14.5L6 14C6 14 2.5 14 2.5 14C2 14 2 13.5 2 13.5L2 1.5C2 1.5 2 1 2.5 1C2.5 1 6 1 6 1C6 1 6 0.5 6 0.5C6 0 9 0 9 0.5zM7.5 3C5 3 3 5 3 7.5C3 10 5 12 7.5 12C10 12 12 10 12 7.5C12 5 10 3 7.5 3z"/>
+  <path d="M7.5 4C7.75 4 10 7 10 8.5C10 10 8.5 11 7.5 11C6.5 11 5 10 5 8.5C5 7 7.25 4 7.5 4zM5.5 8.5C5.5 9.5 6.5 10.5 7.5 10.5C6.5 10 6 9.5 5.5 8.5z"/>
+</svg>