Add user action buttons to Toolbox profile view sidebar

[eritbh]

In the same way we add action buttons to the user info sidebar in new Modmail, we should add those buttons to the sidebar in the profile view window as well. This will make those actions accessible on users with no public post history.

[creesch]

In regards to the usernotes button this is related to #139 then.

[creesch]

Also do we want to add them there or simply to the context menu? If they have no public history it seems overkill to make people open the profile overview.