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/bank-JP.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg id="bank-JP" xmlns="http://www.w3.org/2000/svg" width="15" height="15" viewBox="0 0 15 15">
+  <path d="M12.2808,3.3763l-2.9,3.625H11.25a.75.75,0,0,1,0,1.5H8.5v1h2.75a.75.75,0,0,1,0,1.5H8.5v1.25a1,1,0,0,1-2,0v-1.25H3.75a.75.75,0,1,1,0-1.5H6.5v-1H3.75a.75.75,0,0,1,0-1.5H5.6193l-2.9-3.625A1,1,0,0,1,4.2771,2.1216l.0037.0047L7.5,6.15l3.2192-4.024a1,1,0,0,1,1.5653,1.2453Z"/>
+</svg>