Parent task to track UI work //required// to make Blender 2.8 releasable.
* Make topbar more useful by completing tool system
* T56599: improve statusbar keymap display.
* T53840: add icons for new functionality.
* Viewport navigation icons update.
* T55407: Tabs in N-key sidebar for addons to put commands
* Make messages / progress visible if the statusbar is hidden.