Restructure organization settings and permissions.

This restructures organization settings and permissions to be
more accurately grouped and for the permissions page to not be too
long.

CHANGES:

PROFILE:
    (this was split out)
    organization-profile-admin.handlebars:
        form #1:
            name
            description
            (SUBMIT)
        avatar:
            (UPLOAD)
            (DELETE)

SETTINGS:
    organization-settings-admin.handlebars:
        language (mostly untouched)
        message editing:
            time limit/history/retention
        message feed:
            mandatory-topics
            preview images
            preview websites

PERMISSIONS:
    organization-permissions-admin.handlebars
    (mostly stuff was removed)
    Joining:
        restrict domains
        require invite
    User Identity:
        name changes
        email changes
    Streams/Emoji:
        creating streams:
            waiting period (ADDED)
        adding emojis
    (SUBMIT) for whole panel

The profile group (name, description, avatar) were split into a new
page that did not previously exist, and the permissions was stripped
of message settings (message editing, message feed), but keeping the
"waiting period" input and putting it in the "Streams & custom emoji"
section.

Fixes: #5844.

frontend_tests/zjsunit/zjquery.js

@@ -66,6 +66,9 @@ exports.make_zjquery = function () {
                 };
             },
             empty: noop,
+            eq: function () {
+                return self;
+            },
             expectOne: function () {
                 // silently do nothing
                 return self;