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/ansiescapecodehandler.h

@@ -33,8 +33,8 @@ namespace Utils {
 
 class QTCREATOR_UTILS_EXPORT FormattedText {
 public:
-    FormattedText() { }
-    FormattedText(const FormattedText &other) : text(other.text), format(other.format) { }
+    FormattedText() = default;
+    FormattedText(const FormattedText &other) = default;
     FormattedText(const QString &txt, const QTextCharFormat &fmt = QTextCharFormat()) :
         text(txt), format(fmt)
     { }