Feat: Add folder watcher and auto runner

[AceTugboat]

I'm considering adding a folder watcher for the input folder and auto import runner.

This could be one of two things,

1. a cron job that would run every X number of minutes
2. a celery worker that continuously runs in the background

Both of these process would run a function to check the input dir to see if any new file/folders have been added and kick off a search and process job.

This feature would be toggleable from the settings panel.