[bugfix][hidpi] Scalable SVG theme cursors

Add support for SVG cursor:

      ZoomIn,
      ZoomOut,
      Identify,
      CrossHair,
      CapturePoint,
      Select,
      Sampler,

Icons are provisional: they need some love from
a decent graphics designer.

Fixes #12671

Author: elpaso

images/images.qrc

@@ -604,6 +604,13 @@
         <file>themes/default/mActionResizeSquare.svg</file>
         <file>themes/default/mSourceFields.svg</file>
         <file>flags/zh_Hant.svg</file>
+        <file>themes/default/cursors/mCapturePoint.svg</file>
+        <file>themes/default/cursors/mCrossHair.svg</file>
+        <file>themes/default/cursors/mSampler.svg</file>
+        <file>themes/default/cursors/mSelect.svg</file>
+        <file>themes/default/cursors/mZoomIn.svg</file>
+        <file>themes/default/cursors/mZoomOut.svg</file>
+        <file>themes/default/cursors/mIdentify.svg</file>
     </qresource>
     <qresource prefix="/images/tips">
         <file alias="symbol_levels.png">qgis_tips/symbol_levels.png</file>