Move authentication logic into SolidLogic

[timea-solid]

All logic around authentication should be done in SolidLogic.
For example we have two function currentUser in both repos.

[timea-solid]

I opened PRs over all repos to close this refactoring. The merge of the PR should be done in this order:

• solid-logic: Try move auth solid-logic#28
• pane-registry: Try move auth pane-registry#18
• solid-ui: https://github.com/solid/solid-ui/pull/475
• activitystreams-pane: Try move auth activitystreams-pane#9
• chat-pane: Try move auth chat-pane#74
• contacts-pane: Try move auth contacts-pane#62
• folder-pane: Try move auth folder-pane#28
• issue-pane: Try move auth issue-pane#52
• meeting-pane: Try move auth meeting-pane#45
• profile-pane: Try move auth profile-pane#29
• source-pane: Try move auth source-pane#29
• solid-panes: Try move auth solid-panes#337
• mashlib: Try move auth mashlib#150
• NSS: Try move auth nodeSolidServer/node-solid-server#1665
• solidos: Move auth from ui to logic solidos#126