Build comprehensive documentation for existing functionality

[midgen]

Time to build out the docs.

[kalmiya]

From the readme "Scale it to encompass your desired navigable space", that implies to use the "Scale" instead of using the "Brush Settings" to encompass the area.
Was wondering why I had to go to depth 10 (which takes 1-2 minutes to generate) to get comparable results with uesvon on depth 6 taking seconds - for a 100.000 ^3 volume. Using the Brush Settings instead of the Scale works a lot better :)

... and pretty cool that you picked this up again!