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/osmic/doctor.svg

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   version="1.1"
+   width="100%"
+   height="100%"
+   viewBox="0 0 14 14"
+   id="svg2">
+  <metadata
+     id="metadata8">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <defs
+     id="defs6" />
+  <rect
+     width="14"
+     height="14"
+     x="0"
+     y="0"
+     id="canvas"
+     style="fill:none;stroke:none;visibility:hidden" />
+  <path
+     d="M 7,1 C 5.83929,1 4.667834,1.5047052 3.875,2.5 3.187514,3.3630449 3,4 2.90625,5.0000004 0.01009,5.0238004 0,6.0817104 0,13 l 14,0 C 14,6.0817104 13.9899,5.0237504 11.09375,5.0000004 11,4 10.795537,3.3460958 10.125,2.5 9.334655,1.5027279 8.16071,1 7,1 z M 7,3 C 8.281412,2.99511 9,4 9.0625,5.0000004 l -4.125,0 C 5,4 5.718588,3.0048937 7,3 z m -1,3.0000004 2,0 L 8,8 l 2,0 0,2 -2,0 0,2 -2,0 0,-2 -2,0 0,-2 2,0 z"
+     id="doctor"
+     style="fill:#000000;fill-opacity:1;stroke:none" />
+</svg>