Utils: Modernize further

Many issues, mostly in headers, were not addressed in
e38410b76c

modernize-use-auto
modernize-use-nullptr
modernize-use-override
modernize-use-using
modernize-use-default-member-init
modernize-use-equals-default

Change-Id: I320a51726db881e582b898948d53735ebb06887a
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/uncommentselection.cpp

@@ -32,14 +32,11 @@ using namespace Utils;
 CommentDefinition CommentDefinition::CppStyle = CommentDefinition("//", "/*", "*/");
 CommentDefinition CommentDefinition::HashStyle = CommentDefinition("#");
 
-CommentDefinition::CommentDefinition() :
-    isAfterWhiteSpaces(false)
-{}
+CommentDefinition::CommentDefinition() = default;
 
 CommentDefinition::CommentDefinition(const QString &single, const QString &multiStart,
                                      const QString &multiEnd)
-    : isAfterWhiteSpaces(false),
-      singleLine(single),
+    : singleLine(single),
       multiLineStart(multiStart),
       multiLineEnd(multiEnd)
 {