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/j_bar_lift.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="M7.95 12C8.6 11.36 9 10.48 9 9.5L9 5.12C8.7 4.94 8.5 4.62 8.5 4.25L8.5 2.13L1.56 3C1.29 3.03 1.04 2.84 1 2.56C0.97 2.29 1.16 2.04 1.44 2L8.51 1.12C8.57 0.63 8.99 0.25 9.5 0.25C9.92 0.25 10.28 0.51 10.43 0.88L13.44 0.5C13.71 0.47 13.96 0.66 14 0.94C14.03 1.21 13.84 1.46 13.56 1.5L10.5 1.88L10.5 4.25C10.5 4.62 10.3 4.94 10 5.12L10 9.5C10 11.99 7.99 14 5.5 14L3.5 14C2.95 14 2.5 13.55 2.5 13C2.5 12.45 2.95 12 3.5 12L7.95 12L7.95 12Z"/>
+</svg>