Utils: Add a more user-friendly accessor to BaseAspects by Id

Change-Id: Ic99bd380008afaa88a346d0d5118a1af0a00f5ff
Reviewed-by: BogDan Vatra <bogdan@kdab.com>

src/libs/utils/aspects.h

@@ -125,6 +125,11 @@ public:
         return nullptr;
     }
 
+    template <typename T> T *aspect(Utils::Id id) const
+    {
+        return qobject_cast<T*>(aspect(id));
+    }
+
     void fromMap(const QVariantMap &map) const;
     void toMap(QVariantMap &map) const;