Noise value gap at border edges

[Hellhound]

There is an issue with the generated noise values at the border edges. The values at the borders are not seamless an create a gap/jump. This failure only occurs with the fractal noise algorithm.

[Hellhound]

Issue confirmed, it could be reproduced.

[Hellhound]

The gap was produced by the InverseLerp calculation at the generate method of the FractalNoise object. This calculation has been replaced by a simple calculation to get the value in range [0,1].

Also add some modifiers at the specific noise generators to get better looking results.