Add lock icon (#628)

ext/mixed/img/lock.svg

@@ -0,0 +1 @@
+<?xml version="1.0" encoding="UTF-8"?><svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><path d="M8 1.5c-1.786 0-3.25 1.464-3.25 3.25V7.5H4c-.55226.00006-.99994.44774-1 1v5c.00006.55226.44774.99995 1 1h8c.55226-.00005.99994-.44774 1-1v-5c-.00006-.55226-.44774-.99994-1-1h-.75V4.75C11.25 2.964 9.786 1.5 8 1.5zM8 3c.97538 0 1.75.77462 1.75 1.75V7.5h-3.5V4.75C6.25 3.77462 7.02462 3 8 3z" fill="#333"/></svg>

resources/icons.svg

@@ -31,7 +31,7 @@
      inkscape:cx="12.059712"
      inkscape:cy="6.3977551"
      inkscape:document-units="px"
-     inkscape:current-layer="layer32"
+     inkscape:current-layer="layer37"
      showgrid="true"
      units="px"
      inkscape:snap-center="true"
@@ -1026,7 +1026,7 @@
        inkscape:connector-curvature="0" />
   </g>
   <g
-     style="display:inline"
+     style="display:none"
      inkscape:label="Text Parsing"
      id="g1040"
      inkscape:groupmode="layer"
@@ -1191,4 +1191,13 @@
        style="color:#000000;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:medium;line-height:normal;font-family:sans-serif;font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-feature-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:normal;word-spacing:normal;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;clip-rule:nonzero;display:inline;overflow:visible;visibility:visible;opacity:1;isolation:auto;mix-blend-mode:normal;color-interpolation:sRGB;color-interpolation-filters:linearRGB;solid-color:#000000;solid-opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;color-rendering:auto;image-rendering:auto;shape-rendering:auto;text-rendering:auto;enable-background:accumulate"
        inkscape:transform-center-x="-0.53027355" />
   </g>
+  <g
+     inkscape:groupmode="layer"
+     id="layer37"
+     inkscape:label="Key">
+    <path
+       style="color:#000000;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:medium;line-height:normal;font-family:sans-serif;font-variant-ligatures:normal;font-variant-position:normal;font-variant-caps:normal;font-variant-numeric:normal;font-variant-alternates:normal;font-feature-settings:normal;text-indent:0;text-align:start;text-decoration:none;text-decoration-line:none;text-decoration-style:solid;text-decoration-color:#000000;letter-spacing:normal;word-spacing:normal;text-transform:none;writing-mode:lr-tb;direction:ltr;text-orientation:mixed;dominant-baseline:auto;baseline-shift:baseline;text-anchor:start;white-space:normal;shape-padding:0;clip-rule:nonzero;display:inline;overflow:visible;visibility:visible;opacity:1;isolation:auto;mix-blend-mode:normal;color-interpolation:sRGB;color-interpolation-filters:linearRGB;solid-color:#000000;solid-opacity:1;vector-effect:none;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;stroke-width:2;stroke-linecap:butt;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1;paint-order:normal;color-rendering:auto;image-rendering:auto;shape-rendering:auto;text-rendering:auto;enable-background:accumulate"
+       d="M 8 1.5 C 6.213958 1.5 4.75 2.963958 4.75 4.75 L 4.75 7.5 L 4 7.5 C 3.4477381 7.5000552 3.0000552 7.9477381 3 8.5 L 3 13.5 C 3.0000552 14.052262 3.4477381 14.499945 4 14.5 L 12 14.5 C 12.552262 14.499945 12.999945 14.052262 13 13.5 L 13 8.5 C 12.999945 7.9477381 12.552262 7.5000552 12 7.5 L 11.25 7.5 L 11.25 4.75 C 11.25 2.963958 9.786042 1.5 8 1.5 z M 8 3 C 8.9753818 3 9.75 3.7746182 9.75 4.75 L 9.75 7.5 L 6.25 7.5 L 6.25 4.75 C 6.25 3.7746182 7.0246182 3 8 3 z "
+       id="rect1210" />
+  </g>
 </svg>