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/castle-palace.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 7,1 4,2 4,4 l 6,0 C 10,2 7,1 7,1 z M 1.5,2 C 1.5,2 0,3 0,4.5 L 0,5 3,5 3,4.5 C 3,3 1.5,2 1.5,2 z m 11,0 C 12.5,2 11,3 11,4.5 L 11,5 14,5 14,4.5 C 14,3 12.5,2 12.5,2 z M 4,5 4,7 3,7 3,6 0,6 l 0,7 5,0 c 0,-1 0,-3 2,-3 2,0 2,2 2,3 l 5,0 0,-7 -3,0 0,1 -1,0 0,-2 z M 5.5,6 C 6,6 6,6.7902542 6,7 L 6,8 5,8 5,7 C 5,6.7330508 5,6 5.5,6 z m 3,0 C 9,6 9,6.7902542 9,7 L 9,8 8,8 8,7 C 8,6.7330508 8,6 8.5,6 z m -7,1 C 2.012353,7 2,7.6752871 2,8 L 2,9 1,9 1,8 C 1,7.6752871 1.01461,7 1.5,7 z m 11,0 C 13.012353,7 13,7.6752871 13,8 l 0,1 -1,0 0,-1 c 0,-0.3247129 0.01461,-1 0.5,-1 z"
+     id="castle-palace"
+     style="fill:#000000;fill-opacity:1;stroke:none" />
+</svg>