simple auto action that creates a fill layer at the top of your file.
you can turn on and off the layer to see your work in full colour or black and white (value only).
this is very useful for checking your values during painting.
features:
- the layer is always created at the top regardless of which layer you currently on.
- the layer is marked as draft layer and is a fill layer. these settings make sure that it doesn't interfere your other operations (like selection and changing canvas size) when the layer is on.
- the layer is colour-coded.
