Save Admin API connection configuration

[picimako]

Summary

The WireMock tool window supports a root URL, authenticator and proxy settings for the Admin and Provisioning API, but that data must be re-entered at each execution of IntelliJ.

Provide a way to be able to save such configuration and be able to reload it.

Tasks

• Provide an action (button?) that can save the Admin root URL, authenticator type, authenticator properties, the Host header and proxy host and port.
• Provide an action that can remove configuration in case a user no longer needs it.
• Provide an action that can edit a saved configuration, and save the edited values into the same configuration.
• The configurations would be saved with an arbitrary name specified by users. It would not use an email address/username automatically.

Security

• Make sure that passwords and tokens (and potentially email addresses and usernames) are stored securely. One solution would probably be using the IntelliJ Platform's PasswordSafe class.