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/train_bullet.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg viewBox="0 0 15 15" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+  <path d="M5.75 12.5L5.5 13L9.5 13L9.25 12.5L10.75 12.5L12 15L10.5 15L10 14L5 14L4.5 15L3 15L4.25 12.5L5.75 12.5ZM12.07 8.45C10.43 10.82 8.9 12 7.5 12C6.1 12 4.57 10.82 2.93 8.45L2.93 8.45C2.37 7.64 2.24 6.59 2.6 5.66C2.87 4.97 3 4.42 3 4C3 3 4.35 0 7.5 0C11.13 0 12 3 12 4C12 4.42 12.13 4.97 12.4 5.66L12.4 5.66C12.76 6.59 12.63 7.64 12.07 8.45ZM5.04 2.76L5.83 4.69C5.91 4.88 6.09 5 6.29 5L8.71 5C8.91 5 9.09 4.88 9.17 4.69L9.96 2.76C10.03 2.59 10 2.4 9.89 2.26C9.24 1.42 8.44 1 7.5 1C6.56 1 5.76 1.42 5.11 2.26L5.11 2.26C5 2.4 4.97 2.59 5.04 2.76ZM7.5 11C8.05 11 8.5 10.55 8.5 10C8.5 9.45 8.05 9 7.5 9C6.95 9 6.5 9.45 6.5 10C6.5 10.55 6.95 11 7.5 11Z"/>
+</svg>