Improved Spanish translations

Notable changes:
* Use of inclusive pronouns and words (think they/them but on a language
  that relies on gender for almost every word). Keep in mind this might
  cause some flame from conservative folks.
* Corrected many computer-generated translations (one of them translated
  "resume" to resumé)

fix #1661

If the relay bot and the owner share an IP, legacy bots that identify users
by user@host could misinterpret relayed lines as coming from the bot owner.
Try to avoid this by using the bot's account cloak where applicable.

fix #1647

Send a full NUH with RELAYMSG.

Also fix client-only tags with RELAYMSG.

Add documentation for +f channel mode.

bump irctest, remove travis

feat: build with github actions

migrate additional dependencies to ergochat

first pass at renaming Oragono to Ergo

New Crowdin updates

make MaxLineLen configurable

remove draft/resume-0.5

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.)