Blending imrovements + en-/disabling noise layers

Blending improvements

Previously the generated noise could get very over saturated. This was especially noticable with the vornoi noise. I've now imrpoved the blending between noise layers so that this does not happen as often. I'm still not satisfied with it but it's already much better.

You might have to adjust your power or total brighntess value in order so see your volumes again when loading from your files.

En-/Disabling noise layers

Noise layers can now be individually enabled or disabled.

When loading a volume file you now have to check all 4 checkboxes to see it again.

What's next

I'm currently working on some more complex features like .dds export and preview options. I also want to rework the UI because it's really ugly and is to messy for adding new features.

If you have any more suggestions, let me know!