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/confectionery.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 7,0 C 5.8954305,0 5,0.8954305 5,2 5,3.1045695 5.8954305,4 7,4 8.1045695,4 9,3.1045695 9,2 9,0.8954305 8.1045695,0 7,0 z M 4,4.75 C 2.5662847,4.75 1.3883942,5.550493 1,7 L 2.25,7 C 2.3687008,6.5570024 3,6 4,6 5,6 6,7 7,7 8,7 9,6 10,6 c 1,0 1.614187,0.493139 1.75,1 L 13,7 C 12.585943,5.4547168 11.370795,4.75 10,4.75 c -1.4840832,0 -2.005051,1 -2.96875,1 C 5.9889372,5.75 5.4824519,4.75 4,4.75 z M 1,8 3,13 c 1,1 3,1 4,1 1,0 3,0 4,-1 L 13,8 C 12,8 12,9 11,9 10,9 10,8 9,8 8,8 8,9 7,9 6,9 6,8 5,8 4,8 4,9 3,9 2,9 2,8 1,8 z"
+     id="confectionery"
+     style="fill:#000000;fill-opacity:1;stroke:none" />
+</svg>