[plugin] add support for custom configuration options

[Akarys42]

Is your feature request related to a problem? Please elaborate.

I would like to be able to register new configuration options for my plugin that would be compatible with ?plugin.

Describe the solution you'd like

Add a public API to the configuration manager that allows you to register configuration entries on the fly.

Does your solution involve any of the following?

• Logviewer
• New config option

Describe alternatives you've considered

I could have used a config command specific to my plugin, but that sounds a bit lame. Better integrating plugins would be nice.

Who will this benefit?

It would apply to any plugin that may need a configuration option.

Additional Information

No response