Core/Utils: Migrate further to Utils::Id

The coreplugin/id.h header is kept for downstream for now.

Change-Id: I8c44590f7b988b3770ecdc177c40783e12353e66
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/projectexplorer/clangparser.h

@@ -41,7 +41,7 @@ public:
 
     static QList<Utils::OutputLineParser *> clangParserSuite();
 
-    static Core::Id id();
+    static Utils::Id id();
 
 private:
     Result handleLine(const QString &line, Utils::OutputFormat type) override;