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/ModelVisualization/RivMeasurementPartMgr.cpp

@@ -186,11 +186,13 @@ void RivMeasurementPartMgr::buildPolyLineParts(const cvf::Camera* camera,
             negativeXDir = true;
         }
 
-        auto    backgroundColor = RiaApplication::instance()->preferences()->defaultViewerBackgroundColor;
+        RiaGuiApplication* app = RiaGuiApplication::instance();
+
+        auto    backgroundColor = app->preferences()->defaultViewerBackgroundColor;
         auto    fontColor       = cvf::Color3f::BLACK;
         QString text            = m_measurement->label();
         auto    labelPosition   = pointsInDisplay.back();
-        auto    font            = RiaApplication::instance()->defaultWellLabelFont();
+        auto    font            = app->defaultWellLabelFont();
 
         cvf::ref<cvf::DrawableText> drawableText = new cvf::DrawableText;
         drawableText->setFont(font);