Misc refactors 2024-03-14 (#89)

* Adds method to improve cleanup of empty directories

* resolved bug where source metadata worker could call itself in an infinite loop

* Refactored file deletion for media items

* Removed useless filesystem data worker

* Updated task listing fns to take a record directly

* Refactored the way I call workers

* Improved some tests

lib/pinchflat/yt_dlp/command_runner.ex

@@ -37,7 +37,8 @@ defmodule Pinchflat.YtDlp.CommandRunner do
 
     case System.cmd(command, formatted_command_opts, stderr_to_stdout: true) do
       {_, 0} ->
-        # IDEA: consider deleting the file after reading it
+        # IDEA: consider deleting the file after reading it. It's in the tmp dir, so it's not
+        # a huge deal, but it's still a good idea to clean up after ourselves.
         # (even on error? especially on error?)
         File.read(output_filepath)