adjust style of triangle and caret icons

core/img/actions/caret-dark.svg

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" height="16" width="16" version="1.0" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
- <path style="block-progression:tb;color:#000000;text-transform:none;text-indent:0" fill="#FFF" d="m4 5 4 7 4-6.989z" fill-opacity=".19608"/>
- <path style="block-progression:tb;color:#000000;text-transform:none;text-indent:0" d="m4 4 4 7 4-6.989z"/>
+ <path style="color:#000000;block-progression:tb;text-transform:none;text-indent:0" d="m4 6 4 4 4-3.9941z"/>
 </svg>

core/img/actions/caret.svg

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<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"
-   height="10"
-   width="10"
-   version="1.0"
-   id="svg2"
-   inkscape:version="0.48.4 r9939"
-   sodipodi:docname="caret.svg"
-   inkscape:export-filename="caret.png"
-   inkscape:export-xdpi="179.59"
-   inkscape:export-ydpi="179.59">
-  <metadata
-     id="metadata17">
-    <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>
-  <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="1002"
-     id="namedview15"
-     showgrid="false"
-     inkscape:zoom="36"
-     inkscape:cx="-0.75"
-     inkscape:cy="5"
-     inkscape:window-x="0"
-     inkscape:window-y="34"
-     inkscape:window-maximized="1"
-     inkscape:current-layer="svg2" />
-  <defs
-     id="defs4">
-    <linearGradient
-       id="a"
-       x1="8.4965"
-       gradientUnits="userSpaceOnUse"
-       y1="-.061574"
-       gradientTransform="matrix(1.0526 0 0 .98436 -3.4211 1.0602)"
-       x2="8.4965"
-       y2="8.0832">
-      <stop
-         stop-color="#fff"
-         offset="0"
-         id="stop7" />
-      <stop
-         stop-color="#e6e6e6"
-         offset="1"
-         id="stop9" />
-    </linearGradient>
-  </defs>
-  <path
-     style="block-progression:tb;color:#000000;text-transform:none;text-indent:0;fill:#ffffff;fill-opacity:1"
-     d="m1 1 4 8 4-7.989z"
-     fill="url(#a)"
-     id="path13" />
+<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" height="10" width="10" version="1.0" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
+ <path style="color:#000000;block-progression:tb;text-transform:none;text-indent:0" d="m1 3 4 4 4-3.9941z" fill="#fff"/>
 </svg>

core/img/actions/triangle-e.svg

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" height="16px" width="16px" version="1.1" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
- <path style="block-progression:tb;color:#000000;text-transform:none;text-indent:0" d="m4 12 8-4-7.989-4z"/>
+ <path style="color:#000000;block-progression:tb;text-transform:none;text-indent:0" d="m6 12 4-4-3.9941-4z"/>
 </svg>

core/img/actions/triangle-n.svg

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" height="16px" width="16px" version="1.1" xmlns:cc="http://creativecommons.org/ns#" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dc="http://purl.org/dc/elements/1.1/">
- <path style="block-progression:tb;color:#000000;text-transform:none;text-indent:0" d="m12 12-4-8-4 7.989z"/>
+<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" height="16px" width="16px" version="1.1" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
+ <path style="color:#000000;block-progression:tb;text-transform:none;text-indent:0" d="m12 10-4-4-4 3.9941z"/>
 </svg>

core/img/actions/triangle-s.svg

 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" height="16px" width="16px" version="1.1" xmlns:cc="http://creativecommons.org/ns#" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:dc="http://purl.org/dc/elements/1.1/">
- <path style="block-progression:tb;color:#000000;text-transform:none;text-indent:0" d="m4 4 4 8 4-7.989z"/>
+<svg xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://www.w3.org/2000/svg" height="16px" width="16px" version="1.1" xmlns:cc="http://creativecommons.org/ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
+ <path style="color:#000000;block-progression:tb;text-transform:none;text-indent:0" d="m4 6 4 4 4-3.9941z"/>
 </svg>