#688: forward-confirmed reverse dns

In particular, allow hostnames without periods (like on a LAN).
This shouldn't be a client compability concern since we allow
vhosts without periods.

document relationship between registration.enabled and saregister

Assorted fixes

* Fix #679 (borked reply to `JOIN #chan,\r\n`)
* Replace invalid error parameters with *'s in various places
* Fix PART with no message sending an empty trailing parameter to the channel
* Fix some error responses not getting labeled

fix #561, take two

fix #671

fix #646

fix typos

Merge docker files from oragono-docker repository

-P/--publish-all publishes the container ports on a random
host port, which you have to look up using `docker port`.

In the common case they should be published on the same ports.

This will allow easier building on docker hub and let us automatically
publish tags for each release.

Fixes oragono/oragono-docker#20

Includes a partially backwards-incompatible config change

Deps

bump version and changelog

tweaks to cap listing

add manual entry for private channels

New Crowdin translations

Workaround for #661: this makes the `CAP LS 302` line from the default config
fit on a single line, as long as the server name is at most 35 characters.