Log Message:
audio/fasttracker2: Updates to v1.25

Changes since v1.24

v1.25 - 12.06.2020 (updated 13.06.2020)
- Instrument envelopes now show x/y coords in the top right corner in Instr. Ed.
- The song tempo (BPM) is now *slightly* more accurate for certain BPM values
- Fixed a bug with the XFade function on 16-bit pingpong samples
>> 13.06.2020:
- Make the x/y instr. envelope coords text a bit cleaner