Build environment created
-Makefile setup
 * compiles given *.cpp files in the src directory
 * includes include/
 * uses auto-generated dependencies to let make recompile if a header
   has changed
-Doxygen setup
 * including make target `doc`
SongIdNotifier
class generating MIDI commands on song start and/or stop
-uses XMMS2 song ids to emit specific MIDI commands
-configuration: id map, id offset, MIDI command, MIDI channel,
 little/big endian
-test cases included in main.cpp