ProTracker 2 clone v1.06

• Fix: Don't cut off voices when changing the sample length from the GUI
• When loading a WAV/AIFF sample that has a frequency above 22kHz, show a big
  ask dialog with more details about what is being asked. Some users got
  confused about the old "2X DOWNSAMPLING ?" status text that appeared when
  loading some samples.
• When selecting "Yes" to downsampling a sample before loading it, apply a
  low-pass filter first to get rid of some potential aliasing after
  downsampling. This can now be turned off in protracker.ini (SAMPLELOWPASS).
  I recommend leaving this on, as it might remove quite a bit of aliasing in
  samples with a lot of high frequencies, like hi-hats and cymbals. However,
  some sharpness might get lost. If you need more sharpness, try the "BOOST"
  button in "Edit Op." screen #3. The low-pass filter is only applied to samples
  that are going to get 2x downsampled during load. You'll get a dialog where
  you click yes/no on samples that has a frequency higher than 22kHz.
• Only filter forwards (not backwards as well) when filtering samples in the
  FILTERS toolbox in the sample editor. This makes the selected cutoff more
  correct.
• The sample marking now looks slightly nicer (different color on the center
  line).