Improve building of the Qml/JS scope chain.

* For JS files: Add each Qml component that sources the file in a Script
  tag to the scope chain.
* For Qml components: Add each component that instantiates the component
  to the scope chain.
* Generate the full list of documents required for completion in a
  given file. Previously, files that included the file were missing.

src/libs/qmljs/qmljslink.h

@@ -28,6 +28,9 @@ public:
 private:
     Interpreter::Engine *engine();
 
+    void pushScopeChainForComponent(Document::Ptr doc, QStringList *linkedDocs,
+                                    Interpreter::ObjectValue *scopeObject = 0);
+
     static QList<Document::Ptr> reachableDocuments(Document::Ptr startDoc, const Snapshot &snapshot);
     static AST::UiQualifiedId *qualifiedTypeNameId(AST::Node *node);