[FEATURE] Show Asset Image when AAS is (pre-) selected

[aaronzi]

Currently, if you want to see the thumbnail of an asset, you have to click the Info button on that AAS first. This adds another step to viewing potentially relevant information.

Describe the solution you'd like.

Instead, the AAS list should be split in half. The top half will remain as it is and show the list of all available shells in the configured AAS registry.

The lower half will show the selected AAS as soon as one is selected. In my opinion it is not necessary to be able to close the lower half.

It could basically look like this, but the upper half will have its own scrollbar that can be used independently. The lower half will no longer have a close button.

[aaronzi]

Closed by #135