Done-with: Erik Verbruggen

Just the declaring member isn't enough.

Will be useful for improved scope chain building.

Done-with: Christian Kamm

Both for CppEditor::Internal::SemanticInfo and QmlJSEditor::Internal::
SemanticInfo.

The idea is that it may be a plugin-provided type. We don't want user
code to be riddled with error markers in that case.

Reviewed-by: Roberto Raggi

* 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.

It is used to evaluate expressions to values.
Done to make room for a real 'check' pass.

Fixed the insertion of matching braces when the token at the left of the cursor is a string literal.

Done with: Erik

Done-with: Roberto Raggi

Store the error message in the QTextCharFormat of the extra selection.

It lists the top level function and variable declarations again.

Changed the QML/JS editor to treat .qs/.js files as JavaScript, and invoke the appropriate parser for it.

Reviewed-by: Christian Kamm

Fix namespace usage such that all classes in shared/qml live in the
Qml namespace, and classes in QmlDesigner plugin in the QmlDesigner
namespace.

This should prevent any symbol clashes until we can finally get rid
of the file dublicates (e.g. QmlDocument).