Heightmaps

Xayo wanted to have the creation of heightmaps from greyscale pictures included.
Well, this wasn't too hard. So i just did it.

At the moment it just translates the points 1:1. This makes it kinda unsharpen at very height or very small numbers caused by the nature of floating point numbers.

Soon I should use the absolute Z coordinates feature of fields, too. This should make the whole thing looks alot smoother.