[oauth] add a "token_change" hook

[downtownallday]

This is an enhancement request.

It would be helpful to have a hook similar to the 'password_change' hook (password plugin), that would allow additional actions after a token refresh.

eg. add an exec_hook() call in program/include/rcmail_oauth.php refresh_access_token() after "auth succes".

thanks

[alecpl]

What use-case do you have in mind?

[downtownallday]

I was looking into what it would take to extend the Persistent Login plugin to support oauth and realized this would be required.

[thomascube]

Added hook oauth_refresh_token. See documentation here: https://github.com/roundcube/roundcubemail/wiki/Plugin-Hooks#oauth_refresh_token