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/florist.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg version="1.2" baseProfile="tiny" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 50 50" overflow="inherit">
+  <path d="M25.55 36.17c3.6 16.81 23.92 3.05 3.74 -8.66c22.24 12.91 22.29 -17.92 0.05 -5.02c22.25 -12.9 -4.32 -28.31 -4.32 -2.51c0.01 -25.81 -26.56 -10.4 -4.33 2.51c-22.24 -12.91 -22.26 17.92 -0.02 5.02c-20.19 11.7 0.08 25.48 3.68 8.64l1.2 0.03zm-3.21 -11.17c0 -1.49 1.2 -2.69 2.67 -2.69c1.48 0 2.67 1.2 2.67 2.69c0 1.48 -1.2 2.69 -2.67 2.69c-1.47 0 -2.67 -1.2 -2.67 -2.69z"/>
+</svg>