Embed client id

The client ID used by Anno is not secret as it still requires user authentication on the server.

Settings screen

Changes

1. Add a section "Genesys server"
2. The section has three radio buttons: "Sandbox", "Production" and "Custom"

When the user selects sandbox, the data is pre-filled with Sandbox (https://sandbox.genesys-pgr.org) URLs, and the Client ID: Ap8Od.ydMSWlJ7qL9sJWtXXMCA@sandbox.genesys-pgr.org with no key. Selecting production uses https://www.genesys-pgr.org and the Client ID: fTxcm.TrySiiiOLncyeWfmQKyp@www.genesys-pgr.org. The client secret is blank. The fields in "Genesys API configuration" section are disabled for editing.

Selecting custom just allows the user to edit the settings (current functionality).