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/street_lamp_arm.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="M6 12L7 12C7.55 12 8 12.45 8 13L8 14L2 14L2 13C2 12.45 2.45 12 3 12L4 12L4 4C4 2.34 5.34 1 7 1L13 1L13 3C13 4.1 12.1 5 11 5L10 5C8.9 5 8 4.1 8 3L7.5 3C6.67 3 6 3.67 6 4.5L6 12ZM9 2L9 3C9 3.55 9.45 4 10 4L11 4C11.55 4 12 3.55 12 3L12 2L9 2L9 2Z"/>
+</svg>