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/Application/RiaConsoleApplication.h

@@ -0,0 +1,52 @@
+////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2019-     Equinor ASA
+//
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+//
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+#pragma once
+
+#include "RiaApplication.h"
+
+#include <QCoreApplication>
+
+namespace cvf
+{
+class ProgramOptions;
+}
+
+class RiaConsoleApplication : public QCoreApplication, public RiaApplication
+{
+    Q_OBJECT
+
+public:
+    static RiaConsoleApplication* instance();
+
+    RiaConsoleApplication(int& argc, char** argv);
+    ~RiaConsoleApplication() override;
+
+    // Public RiaApplication overrides
+    void initialize() override;
+    ApplicationStatus handleArguments(cvf::ProgramOptions* progOpt) override;
+    void showInformationMessage(const QString& text) override;
+    void showErrorMessage(const QString& errMsg) override;
+
+protected:
+    // Protected implementation specific overrides
+    void handleEvents(QEventLoop::ProcessEventsFlags flags = QEventLoop::AllEvents) override;
+    void onProjectOpeningError(const QString& errMsg) override;
+    void onProjectOpened();
+    void onProjectClosed();
+};
+