Implement Alpha Tolerance slider

[MichaelHinrichs]

Which component should be improved?

UI/UX

Describe your feature suggestion in more detail

This slider goes from 0 to 255. It's used for sprite masks, and it effects the "coltolerance" variable in GMX files of sprites. There is no control for this in UndertaleModTool.

[luizzeroxis]

I believe this information isn't actually stored in the data file, it just stores the actual bits of the mask, already calculated from the alpha tolerance. Maybe this could be added when importing a mask or in ImportGraphics.csx, but not as a control in the sprite itself. It looks like when importing, it just checks if a pixel is white or not, and ImportGraphics.csx looks if the alpha is more than 0.