This changes the layout of administration for non-administrators such
that they can view organization settings and emoji settings and
displays everything as readonly unless they have the capability to edit.
For now, we just enabled this for the emoji settings and organization
settings features.
This is technically part of the settings page redesign in the next
commit, but it's probably useful to keep separate, since it touches
totally different code.
Previously, this would create a weird blue banner across the top of
the gear menu.
We can't remove it, since it’s required for the gear menu navigation.
Description edited by tabbott.
This is a major change to the /#subscriptions page, converting it to
by a side-by-side list of streams and their settings in an overlay.
There are no new features added/removed, but it's a huge changeset,
because it replaces the old navigation logic and moves the stream
creation modal to appear in the right side of this overlay.