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/telephone.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 2,8 C 1.0118212,8.9881788 0.56004859,10.573569 1.5487288,11.552966 L 2,12 5,9 5,7.5 7.5,5 9,5 12,2 11.489407,1.512712 C 10.513874,0.58170546 8.9807634,1.0192366 8,2 z m 0.5451482,4.537558 0.3387857,0.352887 c 0,0 0.8501688,0.07591 1.2889221,-0.356167 L 5.5665554,11.161784 C 5.9484277,10.759801 5.8738707,9.8572254 5.8738707,9.8572254 L 5.5350852,9.504338 z M 9.5530473,5.5203307 9.8918329,5.8732169 c 0,0 0.8697361,0.1575408 1.2643511,-0.2310704 l 1.393699,-1.372494 C 12.944768,3.8807753 12.87203,2.8612795 12.87203,2.8612795 L 12.533244,2.5083933 z"
+     id="telephone"
+     style="color:#000000;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1;marker:none;visibility:visible;display:inline;overflow:visible;enable-background:accumulate" />
+</svg>