Utils: HighDPI-able, themable undo and redo icons

Change-Id: Id18c547636fe0577c3ef849e7208e430e53ffc7e
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/utils.qrc

@@ -70,6 +70,7 @@
         <file>images/plus.png</file>
         <file>images/plus@2x.png</file>
         <file>images/redo.png</file>
+        <file>images/redo@2x.png</file>
         <file>images/replace_a.png</file>
         <file>images/replace_a@2x.png</file>
         <file>images/replace_b.png</file>
@@ -80,6 +81,7 @@
         <file>images/splitbutton_horizontal.png</file>
         <file>images/splitbutton_horizontal@2x.png</file>
         <file>images/undo.png</file>
+        <file>images/undo@2x.png</file>
         <file>images/unknownfile.png</file>
         <file>images/extension.png</file>
         <file>images/extension@2x.png</file>

src/libs/utils/utilsicons.cpp

@@ -72,10 +72,10 @@ const Icon SAVEFILE({
         {QLatin1String(":/utils/images/filesave.png"), Theme::PanelTextColorMid}}, Icon::Tint);
 const Icon SAVEFILE_TOOLBAR({
         {QLatin1String(":/utils/images/filesave.png"), Theme::IconsBaseColor}});
-const Icon UNDO(
-        QLatin1String(":/utils/images/undo.png"));
-const Icon REDO(
-        QLatin1String(":/utils/images/redo.png"));
+const Icon UNDO({
+        {QLatin1String(":/utils/images/undo.png"), Theme::PanelTextColorMid}}, Icon::Tint);
+const Icon REDO({
+        {QLatin1String(":/utils/images/redo.png"), Theme::PanelTextColorMid}}, Icon::Tint);
 const Icon COPY(
         QLatin1String(":/utils/images/editcopy.png"));
 const Icon PASTE(

src/tools/icons/qtcreatoricons.svg

@@ -3396,6 +3396,36 @@
          inkscape:connector-curvature="0"
          sodipodi:nodetypes="czzzcc" />
     </g>
+    <g
+       id="src/libs/utils/images/undo">
+      <rect
+         style="fill:#ffffff;fill-opacity:1"
+         x="1228"
+         y="568"
+         width="16"
+         height="16"
+         id="rect6782-96-0-0-7-8-1-0-4-0" />
+      <path
+         sodipodi:nodetypes="cccc"
+         inkscape:connector-curvature="0"
+         id="path4757-1"
+         d="m 1233,569.5 -3,3 3,3 z"
+         style="fill:#000000" />
+      <path
+         sodipodi:nodetypes="cccc"
+         inkscape:connector-curvature="0"
+         id="path5163"
+         d="m 1233,580.5 3,0 c 6,0 6,-8 0,-8 l -5,0"
+         style="fill:none;stroke:#000000" />
+    </g>
+    <use
+       x="0"
+       y="0"
+       xlink:href="#src/libs/utils/images/undo"
+       id="src/libs/utils/images/redo"
+       transform="matrix(-1,0,0,1,2488,0)"
+       width="100%"
+       height="100%" />
   </g>
   <g
      inkscape:groupmode="layer"