UI: Expose important settings from file browser popovers

We have established a convention of exposing the most important
settings from popovers, then aligning a popover to control more
detailed settings.

The file browser has powerful display / filtering settings, but
they're hidden in popovers at the moment, so it's sometimes a pain
to use them. The "display as" options are now exposed to the left of
the display settings popover, and the "filter" toggle is exposed to
the left of the filter settings popover. This convention is familiar
and intuitive for users and makes interaction faster.

Note that the "show hidden" item in the filter popover still has an
effect if filtering is disabled.

This commit also:
 - Removes the icons in the "Sort By" enum
 - Uses property split for the "Sort By" enum
 - Very slightly increases the default width of the file browser
   window to make room for the new buttons.

Differential Revision: https://developer.blender.org/D8719

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