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/manufactured_home.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="M11 12L4 12L4 12.5C4 12.78 3.78 13 3.5 13L0.5 13C0.22 13 0 12.78 0 12.5L0 12L0 11L15 11L15 12L15 12.5C15 12.78 14.78 13 14.5 13L11.5 13C11.22 13 11 12.78 11 12.5L11 12ZM9 3L9 2.5C9 2.22 9.22 2 9.5 2L12.5 2C12.78 2 13 2.22 13 2.5L13 3L14.5 3C14.78 3 15 3.22 15 3.5L15 4L0 4L0 3.5C0 3.22 0.22 3 0.5 3L9 3ZM5 10.5L5 6.5C5 6.22 4.78 6 4.5 6L2.5 6C2.22 6 2 6.22 2 6.5L2 10.5L0 10.5L0 4.5L15 4.5L15 10.5L5 10.5ZM9 6L7 6L7 8L9 8L9 6ZM13 6L11 6L11 8L13 8L13 6Z"/>
+</svg>