Add Support for plugin "Boop"

[Brend-Smits]

Would you be able to add support for the plugin "Boop"? Boop breaks DiscordBridge. It prevents the bridge from picking up the chat and sending it to discord.

Dualspiral suggested the following about this:

[ProsperCraft]

We are having the same problem.

[nguyenquyhy]

As said in the plugin description, this is not something that can be done from my side alone:

Discord Bridge does not forward messages that are not public (any messages with custom Sponge channel), to guarantee it does not leak non-public chat (e.g. staff chat) to public Discord channel. Due to this design, currently Discord Bridge does not work with several Sponge plugins that set custom Sponge channel for public chat (e.g. Boop, UltimateChat). The only workaround would be for the authors of those plugins to NOT set custom channel to public messages, or to provide a way for other plugin to differentiate between public and non-public "custom" channel.

[pie-flavor]

I want to keep compatibility, but I need a custom channel so that I can override the transform. Perhaps you could add a way of identifying appropriate custom channels. Maybe this could be customizable?