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/maki/gift.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="15" height="15" viewBox="0 0 15 15" xmlns="http://www.w3.org/2000/svg" id="gift">
+  <path d="M10.5 1.00152C9.0967.957116 7.8503 1.89192 7.5 3.25152 7.1497 1.89192 5.9033.957116 4.5 1.00152 2.7678.947006 2.23515 2.79746 2.81831 4H1.5C1.22386 4 1 4.22386 1 4.5V5.5C1 5.77614 1.22386 6 1.5 6H13.5C13.7761 6 14 5.77614 14 5.5V4.5C14 4.22386 13.7761 4 13.5 4H12.1938C12.8 2.81516 12.2922 1.00143 10.5404 1.00112 10.5269 1.00112 10.5135 1.00122 10.5 1.00152ZM10.6831 4H8.5C8.50082 2.8961 9.3959 2.00152 10.5 2.00152 11.675 2.00152 11.8827 3.87414 10.6831 4ZM6.5 4H4.29187C3.25675 3.88256 3.19576 2.10553 4.3323 2.00152 4.3881 1.99642 4.4442 1.99642 4.5 2.00152 5.60409 2.00152 6.49918 2.8961 6.5 4ZM2 7.00146V11.5015C2 12.3299 2.6716 13.0015 3.5 13.0015H6.5V7.00146H2ZM8.5 7.00146V13.0015H11.5C12.3284 13.0015 13 12.3299 13 11.5015V7.00146H8.5Z"/>
+</svg>