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/RicSummaryCaseRestartDialog.cpp

@@ -21,7 +21,7 @@
 #include "ExportCommands/RicSnapshotViewToFileFeature.h"
 #include "ExportCommands/RicSnapshotFilenameGenerator.h"
 
-#include "RiaApplication.h"
+#include "RiaGuiApplication.h"
 #include "RiaFilePathTools.h"
 #include "RiaLogging.h"
 #include "RiaQDateTimeTools.h"
@@ -611,7 +611,7 @@ void RicSummaryCaseRestartDialog::slotCopyFileNameToClipboard()
 {
     QAction* a = dynamic_cast<QAction*>(sender());
     
-    QClipboard* cb = RiaApplication::clipboard();
+    QClipboard* cb = RiaGuiApplication::clipboard();
     if (cb)
     {
         QString fullFileName = a->data().toString();