Remove the GUI's v0 api dependency

Most of the GUI is using the new v1 API (upload, search, overview page). But there are still bits and pieces that rely on the old v0 api. Those have to be adapted to the new api.

This is necessary before #591 (closed)

• About (uses /info)
• DownloadButton (uses signature token and old download links)
• Download (uses signature token and old download links)
• EditUserdataDialog (old edit api)
• LoginLogout
• MetainfoBrowser (uses old repo quantity aggregations to determine usage)
• ResovleDOI
• ResolvePID
• ArchiveEntryView
• ArchiveLogView
• RawFiles
• MaterialPage (uses old encyclopedia API)
• EntryList (is obsolete and will go away with #576 (closed)
• EntryQuery (uses old repo search)
• remove v0 based api.js and replace with apiV1.js