Instead of passing user settings directly as user_settings
variable to the settings templates, we pass them using
settings_object variable.
This change is important so that we can use the exisiting
display_settings and notification_settings template for
realm-level default settings by passing realm-level
settings using settings_source variable.
The user timezone is only used for user's profile, so we can
move this setting to the Profile panel of settings and this
will also help us in covering some space when there are no
custom profile fields for the organization.
We separate "Your account" section to two different sections -
"Profile" section for user name, custom profile fields, and avatar
and "Account & Security" section for email, password, role, api-key
and deactivating button.
Another important change here is that the modal for changing name
is removed and now the name has a simple input text box and it
behaves similar to inputs for custom-profile-fields.
Fixes#18848.
Sayam Samal
Steve Howell
Sahil Batra
Tim Abbott
sahil839