Improve localStorage

This is just an issue covering stuff i do and plan to do.

• Remove 60s throttle on localstorage saving
• Make it so that saving to localstorage only happens when there's something to save there
• Separate user configuration from instance configuration
• Remove or simplify whitelist of stuff saved to localstorage so that nobody forgets to add new path to the list
• Add a feedback when changes are saved or if there's been an error.

This should fix:

• login/logout problems
• having to wait some time until settings are actually saved (and due to nature of that throttle it's not exactly predictable)
• (see above but also about unread notifications)
• huge mess in code with nearly every thing using setOption to store some stuff, be it user setting or instance name
• feedback should clear up the "...did it save or i'm missing a 'Apply' button?" and "is it actually not saving or somebody forgot to add path to whitelist again?"