Add an option to use HTML mode for signatures by default

[KHRifat]

Please consider enabling the following preferences by default:

• Signature set to → HTML by default. (See https://i.imgur.com/5nhnVS8.jpeg)

These are commonly preferred and it's tedious to enable them manually for every user.

Motivation and context

It would be great to have support for config parameters to control such preferences globally via config.inc.php, just like we already have for:

$config['htmleditor'] = 1;         // 0 = never, 1 = always, 2 = user setting
$config['default_charset'] = 'UTF-8';
$config['draft_autosave'] = 60;    // in seconds

This will make Roundcube easier to manage across deployments where user interaction is limited.

Thanks for your great work!

[alecpl]

All preferences are config options that can be set in config.inc.php.

/ Enables display of email address with name instead of a name (and address in title)
$config['message_show_email'] = false;

As for HTML signatures, there's no such option yet. So, we either create one, or maybe it should use the value stored in htmleditor option.