Persist PostAnnotator, Swimlane and various MbTable display settings

the system should now remember between sessions:

• Swimlane visible
• Lanes visible in Swimlane
• options for Lanes (one lane per user, follow selected etc)
• AnnotationsStream visible

for Files / Timelines / Groups independently:

• List or Grid view
• Items Per Page
• visible Columns
• Sorting (sortBy, ascending/descending)

@christian.hansen : there was a change necessary in MbIconRadioBtn that changes the components behaviour (update internal selection state when the value prop gets changed from the outside). That was not the case before, so maybe something depending on the old behaviour breaks. Quick search showed only one other occurrence of the component in CreateInvite.vue but You probably know better where that component is used and how it's supposed to work there, maybe have a look.

Closes #2068 (closed) Closes #2061 (closed)