Thread management

[The-Voidwalker]

Some user actions will take too long to be stuck behind an infinitely pending post request. These actions should instead launch jobs. Some requirements:

• Certain tasks must be unique (can't start a new one until existing ones finish)
• Status or monitoring (doesn't have to be live, but certainly upon completion)
• Should support:
  • One off tasks
  • Scheduled tasks
  • Repeating tasks

[The-Voidwalker]

Not yet implemented scheduled tasks or monitoring/tracking running/previously ran jobs, but I'm probably happy with what I've got for now in 5219010.

[The-Voidwalker]

Actually, going to reopen as a reminder to at least update the tools page to check if the tool is running before placing the buttons.