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wip: widgets are now viewable, to get the needed testdata switch to the example-dashboard branch in the backend

Remove logging output and do not load simulator and scenarios upon login since they are loaded in their containers anyway

- only token and currentUser are stored (and error msg if any)
- token and current User are stored in local storage and used by app.js
- placeholders in user edit dialogs are replaced by actual values (except for pw)
- UserStore is renamed to LoginStore to resolve naming confusion
- Error notifications are moved to react components instead of data managers/ dispatchers
- updateCurrentUser method was added in UserDataManager for updating own user #197
- cleanup of edit-own-user dialog #197

# Conflicts:
#	src/dashboard/dashboard.js

show only simulation models and dashboards that belong to currently selected scenario, remove users for now, show name of simulator in simulation model list

add subtitle

See merge request !48

cherry picked all changes from the cleanup-widgets branch and merged them to the new file/ folder structure and package versions; most likely, further fixes are required to make things work. Improves #209 and #205