Greenworks v0.22.0 for NW.js v0.103.1

• Greenworks compiled for NW.js v0.103.1
• New authentication APIs #348 (thanks to @Elanis)
  • greenworks.beginAuthSessionAsUser(ticket, steam_id)
  • greenworks.endAuthSessionAsUser(steam_id)
  • greenworks.getAuthSessionTicketForWebAPI(identity, success_callback, [error_callback])
  • validate-auth-ticket event