work around znc's broken nickserv support

fix #394

track channel registrations per account

allow SAREGISTER even when normal registration is fully disabled

fix #392

fix #389

2 small fixes

fix #364

fix another three bugs that were reported today

fix #371

reported by bogdomania

1. KICK without privileges incorrectly returned ERR_CANNOTSENDTOCHAN
2. Halfops should be able to kick voice and unprivileged, but not other halfops

Draft implementation of draft/setname

four small changes

Standard nickserv clients like znc's expect (by default) to send just:

PRIVMSG NickServ :identify $passphrase

with the account name assumed to be the currently held nick.

Let's support this in the common case where the client doesn't have a certfp
(if it does, the first argument is the account name, not the passphrase).

update resume support to draft/resume-0.3

New Crowdin translations