This belongs to the OAuth Epic: #4004 - please read this for the big picture of what this issue is for :)

To allow a user to manage the available clients it is necessary to provide a new screen (probably /settings/clients) that adds the following functionality:

• add a new client
• edit client name
• edit description (optional)
• edit trusted domains
• edit redirect uri
• edit status (development/enabled/disabled)
  • enabled: normal operation mode
  • disabled: client is suspended, can be reactivated
  • development: used to add special restrictions or allowances only used during development. Not needed for first version.
• edit client permissions (scope)
• edit logo
• read and refresh client_id
• read and refresh client_secret
• delete client

The client management interface will need some design guidance from @JohnONolan. Examples can be found here:

• https://my.slack.com/services
• https://twitter.com/settings/applications
• https://github.com/settings/applications