Qml editor: add function declarations to objects or the Script scope.

Enables completion for function declarations inside qml files.

src/libs/qmljs/qmljsbind.h

@@ -156,6 +156,7 @@ private:
 
     Interpreter::ObjectValue *_typeEnvironment;
     Interpreter::ObjectValue *_idEnvironment;
+    Interpreter::ObjectValue *_functionEnvironment;
     Interpreter::ObjectValue *_interestingObjectValue;
     Interpreter::ObjectValue *_rootObjectValue;
 };