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/RicImportGeneralDataFeature.h

@@ -22,6 +22,8 @@
 
 #include "cafCmdFeature.h"
 
+#include <QStringList>
+
 #include <vector>
 
 //==================================================================================================
@@ -32,7 +34,19 @@ class RicImportGeneralDataFeature : public caf::CmdFeature
     CAF_CMD_HEADER_INIT;
 
 public:
-    static bool openEclipseFilesFromFileNames(const QStringList& fileNames);
+    struct OpenCaseResults
+    {
+        QStringList eclipseCaseFiles;
+        QStringList eclipseInputFiles;
+        QStringList eclipseSummaryFiles;
+
+        operator bool() const
+        {
+            return !(eclipseCaseFiles.empty() && eclipseInputFiles.empty() && eclipseSummaryFiles.empty());
+        }
+    };
+
+    static OpenCaseResults openEclipseFilesFromFileNames(const QStringList& fileNames);
 
 protected: