* 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
* 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.
