add Correspondance PerfType and Game.correspondanceDayPerTurn
backend setup correspondance games
Merge branch 'master' of github.com:ornicar/lila into correspondance

* 'master' of github.com:ornicar/lila:
  Re-organise board list
more work on correspondance chess
client-side setup
create correspondance games
more work on correspondence chess
upgrade perf picker
better client-side translation system
load trans files even for english language
lobby correspondence chess creation
Merge branch 'correspondance'

* correspondance:
  lobby correspondence chess creation
  load trans files even for english language
  better client-side translation system
  upgrade perf picker
  more work on correspondence chess
  create correspondance games
  client-side setup
  more work on correspondance chess
  backend setup correspondance games
  add Correspondance PerfType and Game.correspondanceDayPerTurn