v1.4.7 - Return of the Hand Curves

Those who have used this for a long time might remember the useful plots from the SMH companion, which have now made it into the GUI, under the file utils tab. However, there is no auto-refresh yet, so I am not deprecating the companion just yet.
You can see X, Y as well as velocity and acceleration graphs to smooth out kinks in your rails, or fix hard jumps between patterns.

I added detection for a small number of warnings:

• Note / Rail through head area (1 square radius around head center)
• Long rail without intermediate nodes (not interpolated correctly in spiral, also boring to play)
• Position "somewhat far" from neutral position (Note 1). You can generally ignore this one, but it will look weird in spiral.
• Position "far away" from neutral position (Note 1). You can generally ignore this one, but it will look weird in spiral.

If you have ideas for more warnings, or feedback on the existing ones, let me know.
I just started with the spiral ones because I recently did some experimentation for a game bug (Note 1).

In additon to other minor bugs, I also attempted to fix the random errors when adding padding or clicks to audio, or the very least handle that better.

Note 1:
The game appears to use a odd polynomial like output_xy=input_xy - input_xy-^5 to scale positions in spiral, which breaks down once you get more than 65 cm or ~4.75 grid squares from the "neutral position" which is the grid center for specials, and shifted left/right approximately 1.5 grid squares for left/right . If you go more than 1 meter out (~7.3 grid squares), the note even flips to the other side of the play area, because now the input_xy-^5 term gets larger than the input_xy- term.