[Enhancement] Delete media after "x" days (#160)

* [Enhancement] Adds ability to stop media from re-downloading (#159)

* Added column

* Added methods for ignoring media items from future download

* Added new deletion options to controller and UI

* Added controller actions and UI for editing a media item

* Added column to sources

* Added retention period to form

* [WIP] getting retention methods in place

* Hooked up retention worker

* Added column and UI to prevent automatic deletion

* Docs

* Removed unused backfill worker

* Added edit links to media item tabs on source view

* Clarified form wording

* Form wording (again)

lib/pinchflat_web/controllers/media_items/media_item_html.ex

@@ -3,6 +3,14 @@ defmodule PinchflatWeb.MediaItems.MediaItemHTML do
 
   embed_templates "media_item_html/*"
 
+  @doc """
+  Renders a media item form.
+  """
+  attr :changeset, Ecto.Changeset, required: true
+  attr :action, :string, required: true
+
+  def media_item_form(assigns)
+
   def media_file_exists?(media_item) do
     !!media_item.media_filepath and File.exists?(media_item.media_filepath)
   end