Add scripts for rss auto download

[zoriya]

Description

Allow users to define a script to decide if a rss item should be downloaded or not. If the scripts return the magic code of 80 (and regex match if it is specified), the item will be downloaded.

This PR also specifies a user agent of 'flood' for http requests used to retrieve the rss since some servers sent 403 when no user agent was specified.

Related Issue

Screenshots

Types of changes

• Breaking change (changes that break backward compatibility of public API or CLI - semver MAJOR)
• New feature (non-breaking change which adds functionality - semver MINOR)
• Bug fix (non-breaking change which fixes an issue - semver PATCH)

[trim21]

there are several features mixed in this PR, would you mind split them?

[zoriya]

You want one PR for the script & one for the header?

[trim21]

there are also nix file and editor config file

[trim21]

You want one PR for the script & one for the header?

yes

1. you can set miniget options with feedsub directly, there is no need to import miniget.
2. I don't know nix, I can just merge nix file, if you submit it in a seprated PR.
3. empty editorconfig doesn't make sense, please add some meanful content, if you want to submit it.

[zoriya]

I removed the nix & editorconfig files, there was no need to push them mb.

I created a PR for the user agent #779

[trim21]

can you add some example for potential users of this feature？

[zoriya]

Sure, where do you want me to place this example?

I'm using the following script to download every item in the rss that has the same name as one of the existing folders:

#!/usr/bin/env bash
set -e

# Retrive name from rss title ($1) & remove special chars
name=$(guessit "$1" -P "title" | tr -d "[:punct:]")

# Check if we should download the item (if not grep will return 1)
ls /mnt/kyoo/shows/ | tr -d "[:punct:]" | grep -qix "$name"

echo "Downloading $1"
exit 80