Store URL of model and add ability to open URL from model view page

[wogam]

As per title. Thanks!

[cdb-boop]

On my dev branch I've added support for caching model urls in .url files beside the model.

[cdb-boop]

By default, the link button is not shown in the model preview grid. It can be turned on in the settings by selecting Show "Open Model Url" button.

Link in model grid:

Link in model info:

[wogam]

Thank you!