Done with Thorbjorn and Roberto

done with roberto

Reviewed-by: Roberto Raggi

It lists the top level function and variable declarations again.

Ideally most of our visitors won't need to make the QML vs JS
distinction. For these cases it'll be handy to be able to access the AST
no matter whether it's a Program or UiProgram.

Task-number: BAUHAUS-292

This patch ensures that meta info is available for all models
during copy and paste

This is necessary to copy and paste comopnents between different
models.

Expressions are still evaluated in the gui thread, but at least every 100ms
QApplication::processEvents is called.
Evalitation of expression does not completly block the gui anymore.