Support <#channelid> input for non-text channels.

[PsnDth]

It's a manual process on the user side, but category and voice channels can be embedded in the same way as text channels. The regex should be updated to support that argument input as well.

(It's pretty easy to do so, can create a PR as well)

[dukeofsussex]

Do you mean additional argument types? Because those already exist.

[PsnDth]

Not an additional type, the existing category-channel and voice-channel argument types only support entering the ID of the channel or the name of the channel. They don't support stuff like <#123456789123> if it's not a text-channel.