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

ApplicationCode/Commands/ExportCommands/RicSnapshotViewToFileFeature.cpp

@@ -18,7 +18,7 @@
 
 #include "RicSnapshotViewToFileFeature.h"
 
-#include "RiaApplication.h"
+#include "RiaGuiApplication.h"
 #include "RiaLogging.h"
 
 #include "RimMainPlotCollection.h"
@@ -135,7 +135,7 @@ void RicSnapshotViewToFileFeature::onActionTriggered(bool isChecked)
     // If this is done after the file save dialog is displayed (and closed)
     // app->activeViewWindow() returns nullptr on Linux
 
-    RimViewWindow* viewWindow = RiaApplication::activeViewWindow();
+    RimViewWindow* viewWindow = RiaGuiApplication::activeViewWindow();
     if (!viewWindow)
     {
         RiaLogging::error("No view window is available, nothing to do");