Add a way to get the username of the bot in the TwitchChatInput

[hlxid]

Description

It might be very useful to be able to get the username of the bot in the TwitchChatConnector to let a plugin ignore messages from the bot or handle them differently.

References

This is required for derNiklaas/Voteban-Plugin#5.

[networkException]

maybe adding an option to ignore messages send by the bot entirely should be an option

[hlxid]

Yes I think we can include that. Makes the life of plugin devs a bit easier.