Consolidated brush modes issue

[AesaraB]

I'm just spitballing here, I'd be surprised if I got any of these descriptions down correctly.

• Normal
  • Replaces channel values inside brush stroke.
• DecreaseAlpha (Erase)
  • Decreases Alpha inside the brush stroke until 0.
• IncreaseAlpha (Intensify Opacity) Inverse eraser (increase alpha instead of decrease) #407
  • Increases Alpha inside the brush stoke until 1.
• DecreaseAlphaUntilGrayScale (Photo Erase) "color erase" and "behind" brush blend modes #350
  • Decreases Alpha inside the brush stroke until R=G=B or 0.
• NormalIfNotGrayScale "color erase" and "behind" brush blend modes #350
  • Replaces channel values inside brush stroke unless R=G=B.
• SelectionMask Make selection and use selection data #31
  • I'll need to think about this one