Delete media items (#20)

* Added method for deleting media files and their content

* Adds controllers and methods for deleting media and files

* Improved tmpfile setup and teardown for tests

* Actually got tmpfile cleanup running once per suite run

* Finally fixed flash messages

test/test_helper.exs

@@ -4,3 +4,11 @@ Application.put_env(:pinchflat, :yt_dlp_runner, YtDlpRunnerMock)
 ExUnit.start()
 Ecto.Adapters.SQL.Sandbox.mode(Pinchflat.Repo, :manual)
 Faker.start()
+
+ExUnit.after_suite(fn _ ->
+  File.rm_rf!(Application.get_env(:pinchflat, :media_directory))
+  File.rm_rf!(Application.get_env(:pinchflat, :metadata_directory))
+
+  File.mkdir_p!(Application.get_env(:pinchflat, :media_directory))
+  File.mkdir_p!(Application.get_env(:pinchflat, :metadata_directory))
+end)