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/RivWellSpheresPartMgr.cpp

@@ -18,7 +18,7 @@
 
 #include "RivWellSpheresPartMgr.h"
 
-#include "RiaApplication.h"
+#include "RiaGuiApplication.h"
 
 #include "RigMainGrid.h"
 #include "RigSimWellData.h"
@@ -137,7 +137,7 @@ cvf::ref<cvf::Part> RivWellSpheresPartMgr::createPart(std::vector<std::pair<cvf:
     }
 
     cvf::ref<cvf::DrawableVectors> vectorDrawable;
-    if (RiaApplication::instance()->useShaders())
+    if (RiaGuiApplication::instance()->useShaders())
     {
         // NOTE: Drawable vectors must be rendered using shaders when the rest of the application is rendered using shaders
         // Drawing vectors using fixed function when rest of the application uses shaders causes visual artifacts
@@ -169,7 +169,7 @@ cvf::ref<cvf::Part> RivWellSpheresPartMgr::createPart(std::vector<std::pair<cvf:
     part->setDrawable(vectorDrawable.p());
 
     cvf::ref<cvf::Effect> eff = new cvf::Effect;
-    if (RiaApplication::instance()->useShaders())
+    if (RiaGuiApplication::instance()->useShaders())
     {
         if (m_rimReservoirView->viewer())
         {