dcs-hotload 1.3.0

• Hotload.callOnMain(fn) runs fn on the mission's main Lua state and returns like pcall.
  A timer armed from a script is called back on the script's coroutine and crashes DCS once that
  coroutine has been collected; set up timers, event handlers and frameworks such as Skynet inside
  callOnMain instead. The skill says so in place of its advice to cancel such a timer.
• A self-test for callOnMain, selftest/call-on-main: a timer armed through it keeps
  beating after the ended run's coroutine has been collected. Run it after a DCS update.
• The skill says how to drop an interrupted command: deleting only its outbox file runs it
  again; deleting both its files drops it.