Support mpd albumart and readpicture command

[jcorporation]

MPD supports since 0.22 embedded coverart through the new readpicture command. Since version 0.21 the albumart command is implemented, that supports albumart in folders.

Both features are also implemented through direct file system access to music_directory in myMPD without the help of mpd.

My future plan is to keep my current implementation and extend it with the mpd protocol commands to support coverimages, if myMPD has no access to the music_directory.

1) libmpdclient libmpdclient don't support the new commands nor even binary data replies. First step is also to implement patches for libmpdclient.

• [x] Add a low level api to libmpdclient to support binary data
• [x] Add support for albumart command
• [x] Add support for readpicture command

2) myMPD Implement support of both commands through libmpdclient api.

• [x] Rework coverimagesupport
• [x] embed libmpdclient in myMPD distribution
• [x] Add support for albumart command
• [x] Add support for readpicture command

[jcorporation]

In my fork of libmpdclient there exists already two branches for the low level api and the albumart command.

Now I am working on a pull request for the low level api.

[jcorporation]

In my fork of libmpdclient there exists a branch libmympdclient. This branch is embedded in myMPD.