[Feature] remove option in 'Stream' list view

Description

In the Stream list view it should be able to remove each element. For now, it is only possible to clear the whole list when you press Clear media database in the advanced options. This action could be added to the options dialog of the element.

And the big orange plus button in the bottom right corner doesn't add everything, looks like without a function. It is also not really needed here since you enter the url in the field at the top.