System: Enable and use c++20

Enable c++20 in top level cmake. Keep c++17 for GrpcInterface, as the protoc tool does not work with c++20.
Several code adjustments to fix compiler issues.

ApplicationLibCode/Commands/CMakeLists.txt

@@ -89,6 +89,7 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
             -Wno-braced-scalar-init
             -Wno-tautological-constant-out-of-range-compare
             -Wno-undefined-var-template
+            -Wno-ambiguous-reversed-operator
   )
 endif()
 

ApplicationLibCode/Commands/PlotTemplateCommands/RicCreatePlotFromTemplateByShortcutFeature.cpp

@@ -79,7 +79,7 @@ void RicCreatePlotFromTemplateByShortcutFeature::setupActionLook( QAction* actio
     actionToSetup->setText( "Create Plot from Last Used Template" );
     actionToSetup->setIcon( QIcon( ":/SummaryTemplate16x16.png" ) );
 
-    QKeySequence keySeq( Qt::CTRL + Qt::Key_T );
+    QKeySequence keySeq( Qt::CTRL, Qt::Key_T );
 
     applyShortcutWithHintToAction( actionToSetup, keySeq );
 }