Fix bug that crashes server when old session is logged out during login

Fix ban issue

Restore xsd files removed in #1428

ಠ_ಠ

Remove docs in favor of wiki

text adjustments in oracle

Fetched new translations. Arrr!

@ZeldaZach grammar nazi :) 👍

nice alignment over strict tabbing

- removed some info text since oracle imports all cards now and no longer offers sets selection
- added info about token
- `<br/>` --> `\n`
- capitalized `URL` --> http://www.oxforddictionaries.com/definition/english/URL

@marcofernandezheras ok?

Corrected proto warnings & spacing

Extend the login protocol to send the client version (as optional)

Define URLs

Prevent bad flags

Option to opt-out of remember game settings

Translations: extracted new strings

Log old session out of server if logging in from a second location

Use servatrice as docker entrypoint

This lets you "docker run servatrice" and pass command line arguments

Country to lower (fix win bug)

Allows admins to promote users to mod and demote mod to user

Address PR feedback

Fix #1351 - Server ignores only-reg if in "none" auth mode.

When in none auth mode, registered users don't exist; hence the setting
makes the game impossible to join.

Normally the setting would be greyed out when the user is unregistered,
but commit 475c54bf introduced a new edge case where the stored setting
would apply to the field even if the user is unregistered, making the
setting possible to apply in no-reg mode. Regardless, any client could
have done this, not just the default cockatrice.

The server side fix should prevent all issues in the future.