tgstation-server DMAPI v7.1.0

Full changelog can be found here.

• Changed all instances of sleep(1) to sleep(world.tick_lag). (#1788 @Cyberboss)
• Added support for triggering custom TGS events. (#1788 @Cyberboss)
• Added support for codebases that override file2text. (#1788 @Cyberboss)
  #tgs-dmapi-release