When adjusting alpha on a pixel from the color picker it's quite easy to "whiff" the alpha bar and replace your current color with black because the SV box's area for some reason extends several pixels below the alpha bar's. Demonstration in the below image:

I'd recommend the alpha

Is your feature request related to a problem? Please describe.
Using tool Settings requires to manually cast object to the requested type, this is not comfortable to use and might make it more fragile to errors.

Describe the solution you'd like
Change Setting class to Setting<T> where T is a value type of setting. Currently to get ToolSize setting we need to do `(int) Toolba