Divide the notification section into All, Mentions, and Configurable

[frumble]

The current implementation is clunky if you just want to quickly sort a reply from yesterday out. You have to manually untick the other filters in the drop-down menu and reenable them again after. There should be a 3- or 4-sectioned bar with All, Mentions and one or better two configurables. The configurables could have the current drop-down menu for maximum flexibility. The default view should also be configurable. The bar should disappear the moment you start scrolling.

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• Tusky Version: 17
• [x] I searched or browsed the repo’s other issues to ensure this is not a duplicate.