MPDroid: Use app singleton.
JMPDComm: Clean up a few warnings.
JMPDComm: Use explicit numeric assignment to avoid implicit numeric conversion.
MPDStatistics: Refactor with if block conversion to switch.
JMPDComm: Move the MPD protocol delimiter pattern to StringUtils.
MPD.java: Refactor getDir() as a switch.
JMPDComm: When splitting some delimiters, only split once, in the beginning.