No manual refresh should be necessary

[benel]

• [x] on logging in/out
• [x] on going back from a viewpoint to the viewpoint list
• [x] on adding a domain to the white list
• [ ] on closing LaSuli

[benel]

In the future, if the white list can be modified through the settings, a special listener will be needed (see Storage API)

[benel]

A question has been asked on StackOverflow about part 4: https://stackoverflow.com/questions/55898889