Tab completion for nicknames

[Madison]

Users in channel: Phalanxia, PhalanxiaKitten
| = where the user's focused in the chat box.
"Pha| how are you" -> tab pressed -> "Phalanxia, |how are you"
"How are you Pha|" -> tab pressed -> "How are you Phalanxia|"
If you press tab again it will cycle through the users in the channel who start with "Pha"
"How are you Pha|" -> tab pressed -> "How are you Phalanxia|" -> tab pressed -> "How are you PhalanxiaKitten|"

Note: If the word being completed is at the beginning of the message ", " will be added to the end of the completed word. This will be optional and editable via the settings.