Detect if a use is trying to place an invalid ban

Let git track the empty dir "themes/Default"

Theme manager

Log inconsistent session / session table situation

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