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/debugger/debuggerdialogs.h

@@ -82,7 +82,7 @@ public:
     void setPort(const int port);
 
     ProjectExplorer::Kit *kit() const;
-    void setKitId(Core::Id id);
+    void setKitId(Utils::Id id);
 
 private:
     AttachToQmlPortDialogPrivate *d;