JMPDComm: Fix remaining conditional expressions.
Genre: Remove unused field.
Music: Remove dead code.
Make AlbumInfo constructor check for Album Artist
Add rudimentary support for showing/setting rating of current song.

Ratings range from 0 to 10 and are displayed as 0 to 5 stars with
1/2 star resolution.

External changes are not yet noticed.

Layout is... bad.
Update rating display when the server sends a change notification.
Don't explicitly check whether connected.
Log debug message when notified of a sticker change.
Parse sticker command response w/o regex.
MPDConnection: Add isCommandAvailable().

Add the ability to check for command availablility against the current server.
The command list is pulled from the server on initial connection, so, the
cost is minimal.
stickers: Implement a stickers class.

To attempt to avoid bloating the MPD class with more and more stuff, it's time
to begin making classes outside MPD. This is a, more or less, full MPD protocol
stickers implementation as it stands right now.
NotificationHandler: When not running "L" or better, assume dark theme.
BrowseFragment: Check for the listplaylist command prior to running it.

This allows us to avoid an exception parse if a playlist directory isn't setup
on the connected media server.

This will work only on MPD 0.19.2 or later of the standard MPD implementation.
MPDroid: Code style.
NowPlayingFragment: Improve sticker hiding when not supported.
Some German fixes, mostly hyphens
Merge pull request #637 from hurzl/develop

Some German fixes, mostly hyphens
dmix: Gradle updates.
MPDServerException: Add more robust and flexible error handling.

This commit extracts the error code, the command queue position, the command
sent and the ACK error message from the standard ACK error message for use
directly from the exception. This should allow for improved error handling and
cleaner error internationalization.

This commit also allows adding ACK codes to the command constructor to be
considered non-fatal, thus not throw exception.

This commit also adds the permission ACK to the password ACK which will not
allow retries of the current command.
Music: Improve ArrayList initial sizing.