RDFXML pane - add button on header

[timea-solid]

The header elevates some buttons:

• opening the sharing pane (p.s. redesign of sharing pane is a separate ticket)
• Edit button
• and the 3 dots buttons

Remark: these buttons are used everywhere on each pane -> this needs to be in solid-ui and a web component later on
Remark: some of these buttons' functionalities are in the 'under the hood' pane

[bourgeoa]

The 3 dots content is to be discussed this is not a traditional social environment with likes and favourites or sharing actions like send.
Make public/private is not pertinent

I like 3 dots sub menu but context dependent

[timea-solid]

Ok, we shall put it on the team meeting agenda.