#13126 RiaLogging: Extract errorInMessageBox to RiuMessageDialog

Move the QMessageBox-displaying helper out of the logging utility into a
dedicated UI class. RiaLogging.h no longer pulls QMessageBox/QWidget into
the ~270 files that include it. Behavior is preserved: showError displays
the dialog when running interactively (and not under regression tests),
then forwards the text to RiaLogging::error.

ApplicationLibCode/UserInterface/CMakeLists_files.cmake

@@ -75,6 +75,7 @@ set(SOURCE_GROUP_HEADER_FILES
     ${CMAKE_CURRENT_LIST_DIR}/RiuFlowCharacteristicsPlot.h
     ${CMAKE_CURRENT_LIST_DIR}/RiuNightchartsWidget.h
     ${CMAKE_CURRENT_LIST_DIR}/RiuMessagePanel.h
+    ${CMAKE_CURRENT_LIST_DIR}/RiuMessageDialog.h
     ${CMAKE_CURRENT_LIST_DIR}/RiuPlotObjectPicker.h
     ${CMAKE_CURRENT_LIST_DIR}/RiuContextMenuLauncher.h
     ${CMAKE_CURRENT_LIST_DIR}/RiuSummaryCurveDefinitionKeywords.h
@@ -191,6 +192,7 @@ set(SOURCE_GROUP_SOURCE_FILES
     ${CMAKE_CURRENT_LIST_DIR}/RiuFlowCharacteristicsPlot.cpp
     ${CMAKE_CURRENT_LIST_DIR}/RiuNightchartsWidget.cpp
     ${CMAKE_CURRENT_LIST_DIR}/RiuMessagePanel.cpp
+    ${CMAKE_CURRENT_LIST_DIR}/RiuMessageDialog.cpp
     ${CMAKE_CURRENT_LIST_DIR}/RiuPlotObjectPicker.cpp
     ${CMAKE_CURRENT_LIST_DIR}/RiuContextMenuLauncher.cpp
     ${CMAKE_CURRENT_LIST_DIR}/RiuSummaryVectorSelectionUi.cpp