Always Show the Statusbar

Keeps the status bar visible but hides the statusbar panes when a non-editor is focused.

CC: @larz0 
Not necessary for this PR, but since extensions can add/update their own indicators, seems like they should also be able to hide/show then as well. Maybe even remove.

Also would be nice to be able to hide an individual indicator. For example, when linting is disabled, there's no reason to display a disabled indicator.