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/hospital-JP.svg

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg height="15" viewBox="0 0 15 15" width="15" xmlns="http://www.w3.org/2000/svg" id="hospital-JP">
+  <path d="m12.5038 3h-10.00777c-.26639.00235-.52096.11039-.70772.30036-.18677.18998-.29046.44634-.28828.71274v5.5807c-.00063.18713.05047.37079.14765.5307.09718.1599.23667.2899.40305.3755l4.78 2.8394c.20725.1056.43653.1606.6691.1606.23258 0 .46186-.055.6691-.1606l4.78037-2.8394c.1664-.0856.3059-.2155.4031-.3755.0972-.15989.1483-.34357.1476-.5307v-5.5807c.0012-.13194-.0237-.2628-.0732-.38512-.0494-.12232-.1225-.2337-.215-.32777-.0925-.09408-.2027-.16901-.3241-.22052-.1215-.05151-.2519-.07859-.3839-.07969zm-2.0038 5.5h-1.99997v2h-2v-2h-2v-2h2v-2h2v2h1.99997z"/>
+</svg>