(erc-channel-user): Add members for new modes.
(erc-channel-member-halfop-p, erc-channel-user-admin-p)
(erc-channel-user-owner-p): Use new struct members.
- (erc-format-nick, erc-format-@nick): Display user modes as nick prefix.
+ (erc-format-nick, erc-format-@nick): Display user modes as nick prefix.
(erc-nick-prefix-face, erc-my-nick-prefix-face): Add new faces
(erc-get-user-mode-prefix): Return symbol for mode prefix.
(erc-update-channel-member, erc-update-current-channel-member)