Add party chat and party list all command

[Pugzy]

Also updates usage of new style ChannelMessageEvent

[applenick]

Resolved the issue: GSON was unable to serialize Channel<?>, so I converted it to a string using the display name. Since it’s only used to check if it’s an admin channel, I’d say this was the simplest fix. The main commit wasn’t signed, so I pushed it directly to the dev branch.

Thanks again for your work on this Pugzy! Feel free to open another PR if there was anything else you wanted to include. 👍