TextEditor: move Link class to separate header in Utils

Link is a common class and is used across the plugins.

Change-Id: Id92e47e1b8604316ca8b970804e57abaf404ec28
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/qmakeprojectmanager/profileeditor.cpp

@@ -72,9 +72,9 @@ static bool isValidFileNameChar(const QChar &c)
             || c == QLatin1Char('\\');
 }
 
-ProFileEditorWidget::Link ProFileEditorWidget::findLinkAt(const QTextCursor &cursor,
-                                                          bool /*resolveTarget*/,
-                                                          bool /*inNextSplit*/)
+Utils::Link ProFileEditorWidget::findLinkAt(const QTextCursor &cursor,
+                                            bool /*resolveTarget*/,
+                                            bool /*inNextSplit*/)
 {
     Link link;