update the FAQ to cover some controversial issues

fix #1547

make PASSWORD an alias for PASSWD in nickserv

bump irc-go to fix buffering issue

fix #1559

validate that passphrases are valid as non-final IRC parameters

New Crowdin updates

bump irctest to latest upstream master

improve compatibility with published register spec

1. Send COMPLETE_CONNECTION_REQUIRED instead of DISALLOWED
2. Include the account name in all FAIL messages

fix #1563

ERR_INVALIDMODEPARAM should take both the mode and the invalid parameter
as arguments.

As of #1483, websockets entail enforce-utf8, so there's no need
to check globalUTF8EnforcementSetting when handling websockets.

Improve debuggability of some config deserialization errors

1. Text and binary frames are accepted
2. Text frames are sent by default
3. Binary frames are sent to clients who negotiate `binary.ircv3.net`
4. Non-UTF8 data is not accepted (enabling websockets still enables UTFONLY)

bump irc-go to latest

upgrade irctest to new, reintegrated master

bump irc-go to latest

fix #1552

ZNC playback LIST was panicking when history was disabled,
and possibly in other cases

fix #1549

If history is disabled, disable the history CAPs

upgrade go to 1.16

Fixes #1510

New Crowdin updates

bump irc-go for the IRCMessage rename

New Crowdin updates