Make nick tab completion case insensitive where appropriate (like groupchat window)
When tab completing a nick in the groupchat window for instance, case should be ignored. For instance, typing "a<TAB>" should match both "asterix" and "Asterix".
When tab completing a nick in the groupchat window for instance, case should be ignored. For instance, typing "a<TAB>" should match both "asterix" and "Asterix".