audio/fasttracker2: Updates to v1.17

Changes since v1.14:

v1.17 - 03.04.2020
- Fixed some bugs with sample data marking/hand-drawing and sample loop pin
  dragging, which appeared in v1.16.

v1.16 - 02.04.2020
- The mouse system has been rewritten so that we don't need to do mouse
  capturing while interacting with GUI widgets, which could be buggy sometimes.
- The different Disk Op. item paths (mod./instr./smp./pat./trk.) now behave
  exactly like real FT2. I.e. if they haven't been initialized before, they
  will be set to the current working directory.
- Scrollbar thumbs are now limited to minimum 9 pixels in length/height, to
  prevent them from being difficult to click on.

v1.15 - 31.03.2020
- More improvements to S3M loader. Fixes "satellite one.s3m" and other S3Ms.
- Up/down pushbutton delay has been increased even more, to prevent accidentally
  skipping too much.
- Some other small miscellaneous changes not worth of a mention

(fox)