Add config panel to disable Radarr auth system

config_panel.toml

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+version = "1.0"
+
+[authentication]
+
+services = ["__APP__"]
+
+    [authentication.authentication]
+
+        [authentication.authentication.external_authentication]
+        ask.en = "Set Radarr's authentication method to External and rely on YunoHost's permission system."
+        ask.fr = "Paramétrer la méthode d'authentication de Radarr sur External et utiliser le système de permissions de YunoHost."
+        type = "button"

doc/POST_UPGRADE.d/5.0.3.8127~ynh2.md

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+As of recent versions, Radarr is forcing its users to use an authentication method.
+
+Since YunoHost offers its own permissions system you can make sure Radarr's own system is disabled by using the ["Authentication"
+ config panel](#/apps/__APP__/authentication) of the app in YunoHost's webadmin.

doc/POST_UPGRADE.d/5.0.3.8127~ynh2_fr.md

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+Depuis de récentes versions, Radarr force ses utilisateurs à utiliser une méthode d'authentification.
+
+Puisque YunoHost offre son propre système d'authentification vous pouvez désactiver le propre système de Radarr en utilisant [le panneau de configuration "Authentication"](#/apps/__APP__/authentication) de la webadmin de YunoHost.

scripts/config

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+#!/bin/bash
+
+source /usr/share/yunohost/helpers
+ynh_abort_if_errors
+
+data_dir=$(ynh_app_setting_get --app=$app --key=data_dir)
+
+run__external_authentication() {
+    ynh_replace_string --match_string="<AuthenticationMethod>[[:alnum:]]*</AuthenticationMethod>" --replace_string="<AuthenticationMethod>External</AuthenticationMethod>" --target_file="$data_dir/config.xml"
+}
+
+ynh_app_config_run $1