First implementation of Headless (#4392)

* Revert "#4377 Octave : Use RiaLogging for error messages instead of QErrorMessage "

This reverts commit f758a8edb2.

* Revert "#4380 Preferences : Changing scene font size when geo mech view is open causes crash"

This reverts commit df62a41397.

* Revert "#4379 Documentation : Update command line parser for import of summary files"

This reverts commit d0b5357ed4.

* Unfinished WIP

* Builds but crashes

* Refactored code now builds and runs

* ResInsight can now run the unittests headless

* Can run some command files successfully

* Build on Linux

* Extra headless hack header

* Moved PdmUiItem hack to cpp file

* Fix headless crash in RimWellAllocationPlot

* Handle error gracefully if ExportSnapshots command is executed from console

* Add caf::QIconProvider and remove some hacks

* Also made the greying out of disabled icons work for a couple of cases where it didn't.

* Linux build fix

* #4380 Reimplement fix df62a41397 by @magnesj on top of Headless code changes

* #4379 Reintroduce kode from d0b5357ed4 by @magnesj

* #4377 Restore f758a8edb2 in new Headless code

Fwk/AppFwk/cafCommand/cafCmdFeature.cpp

@@ -42,7 +42,7 @@
 #include "cafPdmUiModelChangeDetector.h"
 
 #include <QAction>
-
+#include <QApplication>
 
 namespace caf
 {
@@ -106,7 +106,10 @@ QAction* CmdFeature::actionWithUserData(const QString& customText, const QVarian
         action->setData(userData);
     }
 
-    this->setupActionLook(action);
+    if (dynamic_cast<QApplication*>(QCoreApplication::instance()))
+    {
+        this->setupActionLook(action);
+    }
     if (!customText.isEmpty())
     {
         action->setText(customText);