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/toys.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 2,1.25 C 2.647974,2 2.2974384,2.5190678 2,3 1.7531321,3.399164 1,4.7359503 1,5 1.1245269,5.4647409 1.5570886,5.78125 2,5.78125 2.3792669,5.5622802 2.680369,5.069631 3,4.75 3,4.75 4,6 4,7 4,7.6083221 3,9.875 3,9.875 c 0.1144967,0.1144967 0.7421469,0.430908 1,0.5 0,0 1.0213054,-2.1127596 2,-2.375 0.6239458,-0.1671858 1.4137017,-0.1570981 2,0 0.983714,0.2635854 2,2.375 2,2.375 0.253438,-0.06791 0.826381,-0.399761 1,-0.5 0,0 -0.868693,-1.8849568 -1,-2.375 0,0 -0.4204688,-1.2717267 0,-2 1.290341,-0.7449788 2.5,-0.097874 2.5,2 0.528174,-0.3049415 1.015684,-1.5 1,-2 C 13.024093,3.7238916 11,3 9.5,4.5 8.5345142,3.9425765 6.8650717,3.8842301 5.5,4.25 5.5,2 3.4597458,1.25 2,1.25 z M 2.625,3 C 2.8321068,3 3,3.1678932 3,3.375 3,3.5821068 2.8321068,3.75 2.625,3.75 2.4178932,3.75 2.25,3.5821068 2.25,3.375 2.25,3.1678932 2.4178932,3 2.625,3 z M 1.75,10 1,11 c 0,0 2,2.25 6,2.25 4,0 6,-2.25 6,-2.25 L 12.25,10 C 12.25,10 10,12 7,12 4,12 1.75,10 1.75,10 z"
+     id="toys"
+     style="fill:#000000;fill-opacity:1;stroke:none" />
+</svg>