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/well_pump_powered.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="M5 2L3.5 2C3.25 2 3 1.75 3 1.5C3 1.25 3.25 1 3.5 1L7.5 1C7.75 1 8 1.25 8 1.5C8 1.75 7.75 2 7.5 2L6 2L6 3L7 3C8.1 3 9 3.9 9 5L9 8L13.2 8.8C13.66 8.9 14 9.33 14 9.8L14 10L10.5 10C10.25 10 10 10.25 10 10.5C10 10.75 10.25 11 10.5 11L14 11L14 12L10.5 12C10.25 12 10 12.25 10 12.5C10 12.75 10.25 13 10.5 13L14 13C14 13.5 13.5 14 13 14L7 14C5.67 13.33 5 12.33 5 11C5 9.67 5.67 8.67 7 8L7 5C5.67 5 4 5 4 5L4 7L4.5 7C4.75 7 5 7.25 5 7.5L5 8L1 8L1 7.5C1 7.25 1.25 7 1.5 7L2 7L2 5C2 4 3 3 4 3L5 3L5 2Z"/>
+</svg>