Fixes and improvements
- Add support for multiple MODs on commandline
- Add various loop commandline options
- Fixed Arpeggio which was based on periodtable lookups which
  of course did not work in conjunction with pitch slides
- Changed behaviour of various effects dependent on looping
  options (some mods force looping using dxx)
Various stuff
- added application.h (totally forgot this in last commit)
- updated TODO.txt which I either forgot :-)