Modify icons color

- Update icon from color "2a7fff" to "cccccc"
- Update .svg files with last Inkscape version

rtdata/icons/rawtherapee/scalable/apps/histogram-ellipsis-small.svg

@@ -1,57 +1,15 @@
 <?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"
-   sodipodi:docname="histogram-ellipsis-small.svg"
-   inkscape:version="1.0.1 (3bc2e813f5, 2020-09-07)"
-   inkscape:export-ydpi="96"
-   inkscape:export-xdpi="96"
-   inkscape:export-filename="/tmp/template.png"
    id="SVGRoot"
    version="1.1"
    viewBox="0 0 16 16"
    height="16"
-   width="16">
-  <sodipodi:namedview
-     inkscape:document-rotation="0"
-     inkscape:snap-bbox-midpoints="false"
-     inkscape:snap-grids="true"
-     inkscape:object-nodes="false"
-     inkscape:snap-others="false"
-     inkscape:bbox-nodes="true"
-     inkscape:snap-bbox="true"
-     inkscape:pagecheckerboard="false"
-     inkscape:grid-bbox="true"
-     inkscape:window-maximized="1"
-     inkscape:window-y="0"
-     inkscape:window-x="0"
-     inkscape:window-height="1041"
-     inkscape:window-width="1920"
-     showgrid="true"
-     inkscape:current-layer="layer1"
-     inkscape:document-units="px"
-     inkscape:cy="6.2923433"
-     inkscape:cx="3.5003527"
-     inkscape:zoom="33.366433"
-     inkscape:pageshadow="2"
-     inkscape:pageopacity="0"
-     borderopacity="1.0"
-     bordercolor="#666768"
-     pagecolor="#E0E1E2"
-     id="base">
-    <inkscape:grid
-       dotted="false"
-       empspacing="7"
-       originy="1"
-       originx="1"
-       id="grid1374"
-       type="xygrid" />
-  </sodipodi:namedview>
+   width="16"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:dc="http://purl.org/dc/elements/1.1/">
   <defs
      id="defs815" />
   <metadata
@@ -96,8 +54,6 @@
   </metadata>
   <g
      transform="translate(0,-8)"
-     inkscape:label="Layer 1"
-     inkscape:groupmode="layer"
      id="layer1">
     <rect
        y="10"
@@ -105,28 +61,28 @@
        height="12"
        width="12"
        id="rect896"
-       style="opacity:0.3;fill:#2a7fff;fill-opacity:1;stroke:none;stroke-width:1;stroke-linecap:square;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
+       style="opacity:0.3;fill:#cccccc;fill-opacity:1.0;stroke:none;stroke-width:1;stroke-linecap:square;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
     <rect
        y="9.5"
        x="1.5"
        height="13.000001"
        width="13"
        id="rect849"
-       style="opacity:1;fill:none;fill-opacity:0.3;stroke:#000000;stroke-width:0.999999;stroke-linecap:square;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1" />
+       style="opacity:1;fill:none;fill-opacity:0.3;stroke:#000000;stroke-width:0.999999;stroke-linecap:square;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1.0" />
     <circle
-       style="fill:#2a7fff;fill-opacity:1;stroke-linecap:square"
+       style="fill:#cccccc;fill-opacity:1.0;stroke-linecap:square"
        id="path852"
        cx="4.5"
        cy="16"
        r="1.5" />
     <circle
-       style="fill:#2a7fff;fill-opacity:1;stroke-linecap:square"
+       style="fill:#cccccc;fill-opacity:1.0;stroke-linecap:square"
        id="path852-5"
        cx="8"
        cy="16"
        r="1.5" />
     <circle
-       style="fill:#2a7fff;fill-opacity:1;stroke-linecap:square"
+       style="fill:#cccccc;fill-opacity:1.0;stroke-linecap:square"
        id="path852-6"
        cx="11.5"
        cy="16"