Add icons for the fn layer. #27

The icon for the screen lock was created from two icons: display and
lock4.

images/icons/kbd__fn--calculator.svg

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generated by IcoMoon.io -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="16" height="16" viewBox="0 0 16 16">
+<path fill="#000000" d="M6 1h-5c-0.55 0-1 0.45-1 1v5c0 0.55 0.45 1 1 1h5c0.55 0 1-0.45 1-1v-5c0-0.55-0.45-1-1-1zM6 5h-5v-1h5v1zM14 1h-5c-0.55 0-1 0.45-1 1v13c0 0.55 0.45 1 1 1h5c0.55 0 1-0.45 1-1v-13c0-0.55-0.45-1-1-1zM14 10h-5v-1h5v1zM14 7h-5v-1h5v1zM6 9h-5c-0.55 0-1 0.45-1 1v5c0 0.55 0.45 1 1 1h5c0.55 0 1-0.45 1-1v-5c0-0.55-0.45-1-1-1zM6 13h-2v2h-1v-2h-2v-1h2v-2h1v2h2v1z"></path>
+</svg>

images/icons/kbd__fn--eject.svg

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generated by IcoMoon.io -->
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="16" height="16" viewBox="0 0 16 16">
+<path fill="#000000" d="M0 12h16v2h-16zM8 2l8 8h-16z"></path>
+</svg>

images/icons/kbd__fn--screen-lock.svg

@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Generated by IcoMoon.io -->
+
+<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"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   version="1.1"
+   width="16"
+   height="16"
+   viewBox="0 0 16 16"
+   id="svg2"
+   inkscape:version="0.91 r13725"
+   sodipodi:docname="kbd__fn_screen-lock.svg">
+  <metadata
+     id="metadata10">
+    <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="defs8" />
+  <sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1920"
+     inkscape:window-height="1144"
+     id="namedview6"
+     showgrid="false"
+     inkscape:snap-bbox="true"
+     inkscape:bbox-paths="true"
+     inkscape:bbox-nodes="true"
+     inkscape:snap-bbox-midpoints="true"
+     inkscape:snap-bbox-edge-midpoints="true"
+     showguides="true"
+     inkscape:guide-bbox="true"
+     inkscape:object-nodes="true"
+     inkscape:zoom="57.8125"
+     inkscape:cx="8"
+     inkscape:cy="8"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg2" />
+  <g
+     id="g4163">
+    <path
+       d="M 15,10 1,10 1,2 15,2 15,10 Z M 0,1 0,11 16,11 16,1 0,1 Z"
+       id="path4154" />
+    <path
+       id="path4"
+       d="m 10.5,12 -5,0 -0.5,2 -1,1 8,0 -1,-1 z" />
+    <path
+       style="fill:#000000"
+       inkscape:connector-curvature="0"
+       d="m 9.3599992,5.5200004 -0.08,0 0,-0.959999 c 0,-0.5292796 -0.43072,-0.959999 -0.959999,-0.959999 l -0.6399996,0 c -0.5292795,0 -0.9599991,0.4307195 -0.9599991,0.959999 l 0,0.959999 -0.08,0 c -0.1318398,0 -0.2399997,0.1081599 -0.2399997,0.2399997 l 0,2.3999978 c 0,0.1318395 0.1081599,0.2399997 0.2399997,0.2399997 l 2.7199977,0 c 0.131839,0 0.239999,-0.1081601 0.239999,-0.2399997 l 0,-2.3999978 c 0,-0.1318398 -0.10816,-0.2399998 -0.239999,-0.2399998 z M 7.3600008,4.5600014 c 0,-0.1763198 0.1436798,-0.3199998 0.3199997,-0.3199998 l 0.6399997,0 c 0.176319,0 0.319999,0.14368 0.319999,0.3199998 l 0,0.959999 -1.2799984,0 0,-0.959999 z"
+       id="path4140" />
+  </g>
+</svg>