When serving files using the `X-Accel-Redirect` header in nginx, the
header values must be URL-encoded. Otherwise, nginx will not be able
to serve the files if they contain special characters.
This commit adds a new `FileRedirectResponse` class to the `utils.nginx`
module, to simplify the creation of responses that serve files using the
`X-Accel-Redirect` header.
Fixes#1212, #1223.
This change installs and configures the `mod_zip` nginx module [1],
which allows nginx to stream ZIP files directly.
It includes a workaround needed to correctly calculate CRC-32 values for
included files, by including a new `server` section listening at port
8081, only used for the file requests to be upstream subrequests that
correctly trigger the CRC-32 calculation logic.
Also, to be able to provide a `m3u` file generated on the fly, we add a
`/decode` endpoint fully implemented in nginx using NJS, which receives
a `value` URL param, and decodes it using base64. The decoded value is
returned as the response.
That way, the contents of the `m3u` file is base64-encoded, and set as
part of the response, for `mod_zip` to include it in the ZIP file.
[1] https://github.com/evanmiller/mod_zip
