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/info_board.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="M12.99 11L12.99 15L12 15L12 11L3 11L3 15L2.01 15L2.01 11L2.01 4L0.54 4C0.26 4 0.04 3.78 0.04 3.5C0.04 3.38 0.08 3.26 0.17 3.17L3 0L12 0L14.83 3.17C15.02 3.37 15 3.69 14.79 3.87C14.7 3.95 14.58 4 14.46 4L12.99 4L12.99 11ZM3 4L3 10L12 10L12 4L3 4ZM4.5 5L5.5 5C5.78 5 6 5.22 6 5.5L6 8.5C6 8.78 5.78 9 5.5 9L4.5 9C4.23 9 4 8.78 4 8.5L4 5.5C4 5.22 4.23 5 4.5 5ZM7.5 5L10.5 5C10.77 5 11 5.22 11 5.5L11 6.5C11 6.78 10.77 7 10.5 7L7.5 7C7.22 7 7 6.78 7 6.5L7 5.5C7 5.22 7.22 5 7.5 5ZM7.5 8L10.5 8C10.77 8 11 8.22 11 8.5C11 8.78 10.77 9 10.5 9L7.5 9C7.22 9 7 8.78 7 8.5C7 8.22 7.22 8 7.5 8Z"/>
+</svg>