DataFile: renamed from old multimediaProject class + coding style fixes
First release candidate for 1.0.0

Bumped version number to 0.9.90 in CMakeLists.txt, README and lmms.rc.in.
Merge pull request #244 from softrabbit/stable-0.4

Add Doxyfile and doc directory
Cleaned Bubbly_days.xpf of solo and FX channel settings