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/college.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg id="college" xmlns="http://www.w3.org/2000/svg" width="15" height="15" viewBox="0 0 15 15">
+  <path d="M7.5,1L0,4.5l2,0.9v1.7C1.4,7.3,1,7.9,1,8.5s0.4,1.2,1,1.4V10l-0.9,2.1&#xA; C0.8,13,1,14,2.5,14s1.7-1,1.4-1.9L3,10c0.6-0.3,1-0.8,1-1.5S3.6,7.3,3,7.1V5.9L7.5,8L15,4.5L7.5,1z M11.9,7.5l-4.5,2L5,8.4v0.1&#xA; c0,0.7-0.3,1.3-0.8,1.8l0.6,1.4v0.1C4.9,12.2,5,12.6,4.9,13c0.7,0.3,1.5,0.5,2.5,0.5c3.3,0,4.5-2,4.5-3L11.9,7.5L11.9,7.5z"/>
+</svg>