feature request: Pass original filename to media player when streaming torrent

[TnTora]

Checklist

• I checked that this feature has not been requested before
• I checked that this feature is not in the "Not planned" list
• This feature will benefit the majority of users

Problem Description / Use Case

With the current torrentstream implementation, the player uses "stream" as a the default filename. Having the actual filename available to the player (mostly mpv) would allow the use of custom mpv scripts that rely on it as well as some basic mpv features such as naming screenshots based on filename.

Proposed Solution

Not sure how correct this is (it's my first time using go) but it seems to work with mpv, not sure about the other players.

Registering "/stream/" instead of "/stream" in newServerManager

http.HandleFunc("/stream", ret.serve) to http.HandleFunc("/stream/", ret.serve)

and then inserting the current torrent filename in GetStreamingUrl

func (c *Client) GetStreamingUrl() string {
	if c.torrentClient.IsAbsent() {
		return ""
	}

	settings := c.repository.settings.MustGet()
	if settings.StreamingServerHost == "0.0.0.0" {
		return fmt.Sprintf("http://127.0.0.1:%d/stream", settings.StreamingServerPort)
	}
	return fmt.Sprintf("http://%s:%d/stream", settings.StreamingServerHost, settings.StreamingServerPort)
}

to

func (c *Client) GetStreamingUrl() string {
	if c.torrentClient.IsAbsent() || c.currentFile.IsAbsent() {
		return ""
	}

	settings := c.repository.settings.MustGet()
	if settings.StreamingServerHost == "0.0.0.0" {
		return fmt.Sprintf("http://127.0.0.1:%d/stream/%s", settings.StreamingServerPort, url.PathEscape(c.currentFile.MustGet().DisplayPath()))
	}
	return fmt.Sprintf("http://%s:%d/stream/%s", settings.StreamingServerHost, settings.StreamingServerPort, url.PathEscape(c.currentFile.MustGet().DisplayPath()))
}