Adds ExtraChat Linkshell channels to tab input channel selector. These are only by index, not by channel name due to limitations in the ExtraChat IPC API.
Adds ExtraChat Linkshell channels to the channel selector in the chat log window. As these aren't real channels in-game, these are handled by just sending the corresponding `/eclX` command which causes ExtraChat to set a channel override.
Dean Sheather
Anna