Source stepping and toolbar updates (#8866)

* Move layout options to separate toolbar
* Enable stepping on quantities, remove special history curve stepping for now
* Allow stepping ensembles and cases
* Add step next/prev and add new sub plot

ApplicationExeCode/Resources/ResInsight.qrc

@@ -259,6 +259,10 @@
         <file>well-log-plot.svg</file>
         <file>window-management.svg</file>
         <file>DisableZoom.png</file>
+        <file>AppendNext.svg</file>
+        <file>AppendPrev.svg</file>
+        <file>AppendNext.png</file>
+        <file>AppendPrev.png</file>
     </qresource>
     <qresource prefix="/Shader">
         <file>fs_CellFace.glsl</file>