fix #1642

Fix auditorium JOIN lines with zero values for the time and msgid tags.

New Crowdin updates

update strings

New Crowdin updates

add a warning for the #1634 case

Configurations with require-sasl and open account registration are valid,
but likely unintended. Show a warning about them.

propagate require-sasl into tor-listeners.require-sasl

fix #1622

fix #1634 (forward-porting to master)

fix FAIL REGISTER INVALID_USERNAME case

1. Fix auth bypass in the default configuration with the addition of
   server.password (the REGISTER command was allowed before connection
   registration, allowing unauthenticated users to REGISTER and then
   take advantage of skip-server-password)
2. Caution operators against the use of require-sasl without disabling
   user-initiated account registration. (Such a configuration is still valid
   in the case of a public server that requires everyone to register.)

Allow users to set max MySQL connections and connection lifetime;
set a sane default for max connections if it's not present.

fix autoreplay of DMs

I broke this in #1615 / 0d05ab4ff4

fix #1615

fix #1627

implement mass/global messaging

Fix incorrect description of channel ownership in NS INFO

Remove the CHATHISTORY * and znc.in/playback *self targets,
clean up associated database code, add new mechanisms to play
all missed DMs.

fix #1577

Remove debugging loglines for truncation

upgrade dependencies for 2.7 window

small fixes to kick off the 2.7 window

Allow setting the minimum TLS version

Prevent LUSERS stats from getting out of sync when modes are
modified on offline clients.

Allow snomasks to be added via oper config block, even if the oper
doesn't have `ban` or `snomasks` and therefore can't add snomasks
on their own.

Clean up channels during unregistration if necessary.