don't use AtomicReferenceFieldUpdater — field name could be changed, use our util class

IDEA-123653 NCDFE Could not initialize class com.intellij.javascript.debugger.nashorn.NashornScope
IDEA-123652 EIE at com.intellij.javascript.debugger.nashorn.NashornCallFrame
IDEA-123403 TestNG integration ignoring test classes without default constructor when using testng.@Guice
do not switch scopes when focus is not requested/assume it is autoscroll from source (IDEA-123380)