Mastdon API: Add ability to get a remote account by nickname to

`/api/v1/accounts/:id`

lib/pleroma/plugs/trailing_format_plug.ex

@@ -0,0 +1,40 @@
+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.Plugs.TrailingFormatPlug do
+  @moduledoc "Calls TrailingFormatPlug for specific paths. Ideally we would just do this in the router, but TrailingFormatPlug needs to be called before Plug.Parsers."
+
+  @behaviour Plug
+  @paths [
+    "/api/statusnet",
+    "/api/statuses",
+    "/api/qvitter",
+    "/api/search",
+    "/api/account",
+    "/api/friends",
+    "/api/mutes",
+    "/api/media",
+    "/api/favorites",
+    "/api/blocks",
+    "/api/friendships",
+    "/api/users",
+    "/users",
+    "/nodeinfo",
+    "/api/help",
+    "/api/externalprofile",
+    "/notice"
+  ]
+
+  def init(opts) do
+    TrailingFormatPlug.init(opts)
+  end
+
+  for path <- @paths do
+    def call(%{request_path: unquote(path) <> _} = conn, opts) do
+      TrailingFormatPlug.call(conn, opts)
+    end
+  end
+
+  def call(conn, _opts), do: conn
+end