Add visibility to actors

Also use url helpers to generate urls properly

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

priv/repo/migrations/20190425075451_add_visibility_to_actor.exs

@@ -0,0 +1,21 @@
+defmodule Mobilizon.Repo.Migrations.AddVisibilityToActor do
+  use Ecto.Migration
+
+  alias Mobilizon.Actors.ActorVisibilityEnum
+
+  def up do
+    ActorVisibilityEnum.create_type()
+
+    alter table(:actors) do
+      add(:visibility, ActorVisibilityEnum.type(), default: "private")
+    end
+  end
+
+  def down do
+    alter table(:actors) do
+      remove(:visibility)
+    end
+
+    ActorVisibilityEnum.drop_type()
+  end
+end