Use contains for console dialog suggestions instead of startswith

When adding a node or property in the console sometimes a list of possible suggestions appears. It filters when you start adding some text. That filter now works with a "startswith" filter. That means you have to know the beginning of the name of the text you want to enter.

If we change that to "contains", then the functionality as it now is is still supported. But if you know some other part of the phrase you are looking for, you will also get it as suggestion.

Example: if you want to add a property to a hst:component node, you can just type "tem" and the suggestion "hst:template" will come up. You don't have to type "hst:tem" to get this. So it will be easier and faster.