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/table.svg

@@ -0,0 +1,40 @@
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+<!-- 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 2.9995255,2 c -1.322034,0 -1.322034,1.5 0,1.5 l 8.0000005,0 c 1.33909,0 1.338983,-1.5 0,-1.5 L 2.9995255,2 z m 1,2 -0.75,3 -2.25,0 c -1.322034,0 -1.322034,1.5 0,1.5 l 1.875,0 -0.875,3.5 1.5,0 0.875,-3.5 5.25,0 0.8750005,3.5 1.5,0 -0.875,-3.5 1.875,0 c 1.33909,0 1.338983,-1.5 0,-1.5 l -2.25,0 -0.7500005,-3 -1.5,0 0.75,3 -4.5,0 0.75,-3 -1.5,0 z"
+     id="table"
+     style="fill:#000000;fill-opacity:1;stroke:none" />
+</svg>