Reviewed-by: Christian Kamm

* Context::build was potentially dangerous. Link and ScopeBuilder
  went out of scope before their results stopped being used.
* ScopeBuilder: If no function scope object was found, don't add it.

Reviewed-by: Erik Verbruggen

Reviewed-by: Erik Verbruggen

Done-with: Erik Verbruggen

Done-with: Erik Verbruggen

This used to contain all functions declared in Script blocks. With them
gone, there's no reason to keep it.

Task-number: QTCREATORBUG-1021
Reviewed-by: Erik Verbruggen

Done-with: ckamm

* Fill the snapshot with files that could be imported.
* Implement package imports.

* The qmldir file is not parsed yet.

Reviewed-by: Erik Verbruggen

Done-with: Erik Verbruggen

Done-with: Erik Verbruggen

Just the declaring member isn't enough.

Instead of only maintaining a flat list of scopes, actually store the
global, component chain, root object, scope object, function, id and js
scopes separately.

Done-with: Christian Kamm

* Add SemanticHighlighter to QmlJSTextEditor to update the semantic info
  in a background thread.
* Add QmlJS::Check to run semantic checks on qml and js documents.
* Add a check for incorrect property names.
* Fix hoverhandler to show tool tips from extra selections over help
  tooltips.

Done-with: ckamm

* Support for lookup JS vs Qml
* Bind global variables.

Done-with: ckamm

Done-with: Roberto

Done with ckamm

Done-with: Christian Kamm