Add file name to dict in mpd.

[BlitzKraft]

Fixes #1693

Now the player mpd segment can also display filename.

[ZyX-I]

Missing documentation update.

[BlitzKraft]

@ZyX-I

I don't see where I can update the docs. The docs folder is where I can update the documentation, right?

[ZyX-I]

No, documentation for segments is in source code. It is common for all player segments.

And you also missed an update to PlayerSegment class.

[ZyX-I]

(Documentation is below PlayerSegment class. Missed default value for the new key and documentation for it.)

[BlitzKraft]

Made all the changes. Added in documentation and added default value in the player segment class.

[ZyX-I]

I do not see why this must be MPD only, and this is not an option. Should be something like “(!No ‘show’, this is a parameter which exists, it cannot do any actions) File name of the song currently being played.” Plus some note in mpd documentation that “file” parameter is set to the file name with path relative to the default MPD music directory.